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    copied!<p>HTML:</p> <pre><code>&lt;form&gt; &lt;fieldset&gt; &lt;p&gt; &lt;label for="selectType"&gt;Type:&lt;/label&gt; &lt;select id="selectType" name="type"&gt; &lt;option value="Hotel" data-cost="40"&gt;Hotel&lt;/option&gt; &lt;option value="Restaurant" data-cost="80"&gt;Restaurant&lt;/option&gt; &lt;option value="Casino" data-cost="35"&gt;Casino&lt;/option&gt; &lt;/select&gt; &lt;/p&gt; &lt;p&gt; &lt;label for="selectLevel"&gt;Level:&lt;/label&gt; &lt;select id="selectLevel" name="level"&gt; &lt;option value="1" data-cost="0"&gt;1&lt;/option&gt; &lt;option value="2" data-cost="15"&gt;2&lt;/option&gt; &lt;option value="3" data-cost="30"&gt;3&lt;/option&gt; &lt;/select&gt; &lt;/p&gt; &lt;p&gt; Total Cost: $&lt;span id="cost"&gt;0&lt;/span&gt; &lt;/p&gt; &lt;p&gt;&lt;input type="submit" value="Go!"&gt;&lt;/p&gt; &lt;/fieldset&gt; &lt;/form&gt; </code></pre> <p>jQuery:</p> <pre><code>$(function() { $("#selectType, #selectLevel").change(function() { var type = $("#selectType"), level = $("#selectLevel"), cost = $("#cost"), typeCost = type.find(":selected").data('cost'), levelCost = level.find(":selected").data('cost'), total = typeCost + levelCost; cost.html(total); }).change(); // invoke the .change() trigger }); </code></pre> <p><a href="http://jsfiddle.net/72p58/1/" rel="nofollow" title="See it in action here">See it in action here</a></p> <p>You might want to also set something like "data-multiplier" for the level... whereas level 2 may have a 1.5x multiplier, and level 3 may have a 2x multiplier. You'd have to adjust the jQuery accordingly as well (<code>total = typeCost * levelCostMultiplier</code>, for example).</p>
 

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