title: Syntax of Onchange event while creating a combo box in php
body: <pre><code>&lt;?php   
   echo "*Select Category&lt;select name='category' id='category' onChange='ajax('fill.php', '', 'populate', 'post', '1')'&gt;&lt;option value=''&gt;--Please Select--&lt;/option&gt;&lt;option value='1' &gt;1&lt;/option&gt;&lt;option value='2'&gt;2&lt;/option&gt;&lt;/select&gt;";
  ?&gt;
  </code></pre>
  
  <p>What should come instead of codes(') for the arguements inside ajax function.</p>