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    copied!<p>make this html structure on landing page</p> <pre><code>&lt;p&gt;&lt;b&gt;Category:&lt;/b&gt;&lt;br /&gt; &lt;?php $query="SELECT id,cat FROM cat"; $result = mysql_query ($query); echo"&lt;select name='cselect3' onChange='loadSubCats(this.value)' class='e1'&gt;&lt;option value='0'&gt;Please Select A Category&lt;/option&gt;"; // printing the list box select command while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt echo "&lt;option value=\"".htmlspecialchars($catinfo['cat'])."\"&gt;".$catinfo['cat']." &lt;/option&gt;"; } echo"&lt;/select&gt;"; ?&gt; &lt;div id='sub_categories'&gt;&lt;/div&gt; </code></pre> <p>make a js function assigned to the category dropdown</p> <pre><code>function loadSubCats(value) { $.post('load_sub_cats.php',{catid : value},function{data} { $('#sub_categories').html(data); }); } </code></pre> <p>now in your load_sub_cats.php</p> <pre><code>&lt;p&gt;&lt;b&gt;Subcat1:&lt;/b&gt;&lt;br /&gt; &lt;?php $catid = $_POST['cat_id'] $query="SELECT id,subcat FROM subcat where catid = $catid"; $result = mysql_query ($query); echo"&lt;select name='sselect1' class='e1'&gt;&lt;option value='0'&gt;Please Select A Category&lt;/option&gt;"; // printing the list box select command while($catinfo=mysql_fetch_array($result)){//Array or records stored in $nt echo "&lt;option value=\"".htmlspecialchars($catinfo['subcat'])."\"&gt;".$catinfo['subcat']."&lt;/option&gt;"; } echo"&lt;/select&gt;"; ?&gt; </code></pre> <p>You will need to include jquery to this code work.</p>
 

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