diff --git a/predict/css/calc.css b/predict/css/calc.css
index a90bd8f..9a8b852 100644
--- a/predict/css/calc.css
+++ b/predict/css/calc.css
@@ -18,6 +18,10 @@
     padding-right: 3px;
 }
 
+.constants_header {
+    font-weight: bold;
+}
+
 .input_label {
     text-align: center;
 }
diff --git a/predict/css/pred.css b/predict/css/pred.css
index b66b566..0d3d507 100644
--- a/predict/css/pred.css
+++ b/predict/css/pred.css
@@ -54,6 +54,30 @@ a { text-decoration: underline; color: #333; cursor: pointer; }
     display: none;
 }
 
+#burst-calc-wrapper {
+    position: absolute;
+    left: 50%;
+    top: 50%;
+    width: 400px;
+    margin-left: -200px;
+    margin-top: -200px;
+    padding: 1em;
+    text-align: center;
+    display: none;
+}
+
+/*
+#burst-calc {
+    display: none;
+    padding: 5px;
+    text-align: center;
+}
+*/
+
+#burst-calc-constants {
+    display: none;
+}
+
 #location_save {
     position: absolute;
     left: 50%;
@@ -78,10 +102,6 @@ a { text-decoration: underline; color: #333; cursor: pointer; }
     display: none;
 }
 
-#burst-calc-constants {
-    display: none;
-}
-
 .box {
     position: absolute; 
     background-color: white; 
@@ -145,12 +165,6 @@ a { text-decoration: underline; color: #333; cursor: pointer; }
     bottom: 0; right: 0;
 }
 
-#burst-calc {
-    display: none;
-    padding: 5px;
-    text-align: center;
-}
-
 #scenario_info {
     position: absolute;
     top: 25px;
diff --git a/predict/index.php b/predict/index.php
index 7f24d59..27e9e81 100644
--- a/predict/index.php
+++ b/predict/index.php
@@ -142,6 +142,142 @@ google.load("jqueryui", "1.8.1");
     No guarantee is given for the accuracy, precision or reliability of the data produced by this software, and you use it entirely at your own risk. For more information, see #highaltitude on irc.freenode.net.
 </div>
 
+<!-- burst calculator window -->
+<div id="burst-calc-wrapper" class="box ui-corner-all">
+    <div id="burst-calc">
+        <b>Burst Calculator</b>
+        <br>
+        <table id="input_table">
+            <tr class="input_row">
+                <td class="input_label" colspan="2">Payload Mass (g)</td>
+                <td class="input_instruction" rowspan="3">AND</td>
+
+                <td class="input_label" colspan="2">Balloon Mass (g)</td>
+            </tr>
+            <tr class="input_row">
+                <td colspan="2">
+                    <input type="text" id="mp" class="input_field" value="1500" 
+                        tabindex="1"/>
+                </td>
+                <td colspan="2">
+                    <select class="input_field" id="mb" tabindex="2"> 
+
+                        <option value="200">200</option>
+                        <option value="300">300</option>
+                        <option value="350">350</option>
+                        <option value="450">450</option>
+                        <option value="500">500</option>
+                        <option value="600">600</option>
+
+                        <option value="700">700</option>
+                        <option value="800">800</option>
+                        <option value="1000" selected="selected">1000</option>
+                        <option value="1200">1200</option>
+                        <option value="1500">1500</option>
+                        <option value="2000">2000</option>
+
+                        <option value="3000">3000</option>
+                    </select>
+                </td>
+            </tr>
+            <tr class="warning_row">
+                <td colspan="2" id="mp_w">&nbsp;</td>
+                <td colspan="2" id="mb_w">&nbsp;</td>
+            </tr>
+            <tr>
+                <td class="input_instruction" colspan="5">THEN</td>
+            </tr>
+            <tr class="input_row">
+                <td class="input_label" colspan="2">Target Burst Altitude (m)</td>
+
+                <td class="input_instruction" rowspan="3">OR</td>
+                <td class="input_label" colspan="2">Target Ascent Rate (m/s)</td>
+            </tr>
+            <tr class="input_row">
+                <td colspan="2">
+                    <input type="text" id="tba" class="input_field" value="33000" tabindex="3"/>
+                </td>
+                <td colspan="2">
+
+                    <input type="text" id="tar" class="input_field" tabindex="4"/>
+                </td>
+            </tr>
+            <tr class="warning_row">
+                <td id="tba_w" colspan="2">&nbsp;</td>
+                <td id="tar_w" colspan="2">&nbsp;</td>
+            </tr>
+            <tr class="output_row">
+                <td class="output_label">Burst Altitude:</td>
+                <td class="output_data"><span id="ba">33000</span> m</td>
+                <td></td>
+                <td class="output_label">Ascent Rate:</td>
+                <td class="output_data"><span id="ar">2.33</span> m/s</td>
+
+            </tr>
+            <tr class="output_row">
+                <td class="output_label">Time to Burst:</td>
+                <td class="output_data"><span id="ttb">238</span> min</td>
+                <td></td>
+                <td class="output_label">Neck Lift:</td>
+                <td class="output_data"><span id="nl">1733</span> g</td>
+
+            </tr>
+            <tr class="output_row">
+                <td class="output_label">Launch Volume:</td>
+                <td class="output_data"><span id="lv_m3">2.66</span> 
+                    m<sup>3</sup></td>
+                <td></td>
+                <td class="output_data"><span id="lv_l">2660</span> L</td>
+                <td class="output_data"><span id="lv_cf">93.9</span>
+                     ft<sup>3</sup></td>
+
+            </tr>
+        </table>
+        <br>
+        <input type="button" id="burst-calc-advanced-show"
+            name="burst-calc-advanced-show" value="Advanced">
+        <input type="button" id="burst-calc-use" name="burst-calc-submit" 
+            value="Use Values"/ >
+        <input type="button" id="burst-calc-close" name="burst-calc-submit" 
+            value="Close"/ >
+    </div>
+
+    <!-- these are the burst calc constants -->
+    <div id="burst-calc-constants">
+        <div class="constants_header">Constants</div><br />
+        <div class="constants_warning">
+            For advanced use only! You can probably leave these alone.
+        </div><br />
+        <label class="constant_label" for="gas">Gas</label><br />
+        <select id="gas" class="constant_field">
+            <option value="he">Helium</option>
+            <option value="h">Hydrogen</option>
+
+            <option value="ch4">Methane</option>
+            <option value="custom">Custom</option>
+        </select><br />
+        <label class="constant_label" for="rho_g">Gas Density (kg/m<sup>3</sup>)</label><br />
+        <input type="text" id="rho_g" value="0.1786" class="constant_field" size="9" disabled="disabled"/><br />
+        <label class="constant_label" for="rho_a">Air Density (kg/m<sup>3</sup>)</label><br />
+
+        <input type="text" id="rho_a" value="1.2050" class="constant_field" size="9"/><br />
+        <label class="constant_label" for="adm">Air Density Model</label><br />
+        <input type="text" id="adm" value="7238.3" class="constant_field" size="9"/><br />
+        <label class="constant_label" for="ga">Gravitational<br />Acceleration (m/s<sup>2</sup>)</label><br />
+        <input type="text" id="ga" value="9.80665" class="constant_field" size="9" /><br />
+        <label class="constant_label" for="bd">Burst Diameter (m)</label><br />
+
+        <input type="checkbox" id="bd_c" />
+        <input type="text" id="bd" class="constant_field" size="9" disabled="disabled" value="7.86"/><br />
+        <label class="constant_label" for="cd">Balloon Cd</label><br />
+        <input type="checkbox" id="cd_c" />
+        <input type="text" id="cd" class="constant_field" size="9" disabled="disabled" value="0.3"/><br />
+        <br />
+        <input type="button" id="burst-calc-advanced-hide" 
+            name="burst-calc-advanced-hide" value="Back">
+    </div>
+</div>
+
 <!-- launch card form -->
 <div id="input_form" class="box ui-corner-all"> 
 <img class="handle" src="images/drag_handle.png" />
@@ -264,136 +400,7 @@ google.load("jqueryui", "1.8.1");
 </table>
 </form>
 
-<!-- Burst calculator div, hidden onLoad -->
-<div id="burst-calc">
-    <b>Burst Calculator</b>
-    <br>
-    <table id="input_table">
-        <tr class="input_row">
-            <td class="input_label" colspan="2">Payload Mass (g)</td>
-            <td class="input_instruction" rowspan="3">AND</td>
-
-            <td class="input_label" colspan="2">Balloon Mass (g)</td>
-        </tr>
-        <tr class="input_row">
-            <td colspan="2">
-                <input type="text" id="mp" class="input_field" value="1500" 
-                    tabindex="1"/>
-            </td>
-            <td colspan="2">
-                <select class="input_field" id="mb" tabindex="2"> 
-
-                    <option value="200">200</option>
-                    <option value="300">300</option>
-                    <option value="350">350</option>
-                    <option value="450">450</option>
-                    <option value="500">500</option>
-                    <option value="600">600</option>
-
-                    <option value="700">700</option>
-                    <option value="800">800</option>
-                    <option value="1000" selected="selected">1000</option>
-                    <option value="1200">1200</option>
-                    <option value="1500">1500</option>
-                    <option value="2000">2000</option>
-
-                    <option value="3000">3000</option>
-                </select>
-            </td>
-        </tr>
-        <tr class="warning_row">
-            <td colspan="2" id="mp_w">&nbsp;</td>
-            <td colspan="2" id="mb_w">&nbsp;</td>
-        </tr>
-        <tr>
-            <td class="input_instruction" colspan="5">THEN</td>
-        </tr>
-        <tr class="input_row">
-            <td class="input_label" colspan="2">Target Burst Altitude (m)</td>
-
-            <td class="input_instruction" rowspan="3">OR</td>
-            <td class="input_label" colspan="2">Target Ascent Rate (m/s)</td>
-        </tr>
-        <tr class="input_row">
-            <td colspan="2">
-                <input type="text" id="tba" class="input_field" value="33000" tabindex="3"/>
-            </td>
-            <td colspan="2">
-
-                <input type="text" id="tar" class="input_field" tabindex="4"/>
-            </td>
-        </tr>
-        <tr class="warning_row">
-            <td id="tba_w" colspan="2">&nbsp;</td>
-            <td id="tar_w" colspan="2">&nbsp;</td>
-        </tr>
-        <tr class="output_row">
-            <td class="output_label">Burst Altitude:</td>
-            <td class="output_data"><span id="ba">33000</span> m</td>
-            <td></td>
-            <td class="output_label">Ascent Rate:</td>
-            <td class="output_data"><span id="ar">2.33</span> m/s</td>
-
-        </tr>
-        <tr class="output_row">
-            <td class="output_label">Time to Burst:</td>
-            <td class="output_data"><span id="ttb">238</span> min</td>
-            <td></td>
-            <td class="output_label">Neck Lift:</td>
-            <td class="output_data"><span id="nl">1733</span> g</td>
-
-        </tr>
-        <tr class="output_row">
-            <td class="output_label">Launch Volume:</td>
-            <td class="output_data"><span id="lv_m3">2.66</span> 
-                m<sup>3</sup></td>
-            <td></td>
-            <td class="output_data"><span id="lv_l">2660</span> L</td>
-            <td class="output_data"><span id="lv_cf">93.9</span>
-                 ft<sup>3</sup></td>
-
-        </tr>
-    </table>
-    <br>
-    <input type="button" id="burst-calc-use" name="burst-calc-submit" 
-        value="Use Values"/ >
-    <input type="button" id="burst-calc-close" name="burst-calc-submit" 
-        value="Close"/ >
-</div>
-
-<!-- these are the burst calc constants -->
-<div id="burst-calc-constants">
-    <div class="constants_header">Constants</div><br />
-    <div class="constants_warning">
-        For advanced<br />use only!<br /><br />
-
-        You can probably<br />leave these alone.<br />
-    </div><br />
-    <label class="constant_label" for="gas">Gas</label><br />
-    <select id="gas" class="constant_field">
-        <option value="he">Helium</option>
-        <option value="h">Hydrogen</option>
-
-        <option value="ch4">Methane</option>
-        <option value="custom">Custom</option>
-    </select><br />
-    <label class="constant_label" for="rho_g">Gas Density (kg/m<sup>3</sup>)</label><br />
-    <input type="text" id="rho_g" value="0.1786" class="constant_field" size="9" disabled="disabled"/><br />
-    <label class="constant_label" for="rho_a">Air Density (kg/m<sup>3</sup>)</label><br />
-
-    <input type="text" id="rho_a" value="1.2050" class="constant_field" size="9"/><br />
-    <label class="constant_label" for="adm">Air Density Model</label><br />
-    <input type="text" id="adm" value="7238.3" class="constant_field" size="9"/><br />
-    <label class="constant_label" for="ga">Gravitational<br />Acceleration (m/s<sup>2</sup>)</label><br />
-    <input type="text" id="ga" value="9.80665" class="constant_field" size="9" /><br />
-    <label class="constant_label" for="bd">Burst Diameter (m)</label><br />
-
-    <input type="checkbox" id="bd_c" />
-    <input type="text" id="bd" class="constant_field" size="9" disabled="disabled" value="7.86"/><br />
-    <label class="constant_label" for="cd">Balloon Cd</label><br />
-    <input type="checkbox" id="cd_c" />
-    <input type="text" id="cd" class="constant_field" size="9" disabled="disabled" value="0.3"/><br />
-</div>
+<!-- Burst calculato>
 
 
 </div>
diff --git a/predict/js/pred.js b/predict/js/pred.js
index 0885c26..29ae2ab 100644
--- a/predict/js/pred.js
+++ b/predict/js/pred.js
@@ -34,6 +34,8 @@ $(document).ready(function() {
     $("#req_sub_btn").button();
     $("#burst-calc-use").button();
     $("#burst-calc-close").button();
+    $("#burst-calc-advanced-show").button();
+    $("#burst-calc-advanced-hide").button();
 
     // see if we want an old prediction displayed
     if ( current_uuid != '0' ) {
@@ -670,21 +672,29 @@ function setupEventHandlers() {
     });
     // activate the "use burst calc" links
     $("#burst-calc-show").click(function() {
-        $("#modelForm").hide();
-        $("#burst-calc").show();
+        $("#burst-calc-wrapper").show();
     });
     $("#burst-calc-use").click(function() {
         // Write the ascent rate and burst altitude to the launch card
         $("#ascent").val($("#ar").html());
         $("#burst").val($("#ba").html());
-        $("#burst-calc").hide();
-        $("#modelForm").show();
+        $("#burst-calc-wrapper").hide();
     });
     $("#burst-calc-close").click(function() {
         // Close the burst calc without doing anything
-        $("#burst-calc").hide();
+        $("#burst-calc-wrapper").hide();
         $("#modelForm").show();
     });
+    $("#burst-calc-advanced-show").click(function() {
+        // Show the burst calculator constants
+        $("#burst-calc").slideUp();
+        $("#burst-calc-constants").slideDown();
+    });
+    $("#burst-calc-advanced-hide").click(function() {
+        // Show the burst calculator constants
+        $("#burst-calc-constants").slideUp();
+        $("#burst-calc").slideDown();
+    });
     // attach onchange handlers to the lat/long boxes
     $("#lat").change(function() {
         plotClick();