How to use value from a pick list?

I'd like to have a form that does the following: User picks a site from a dropdown list from a MySQL db (that works - code below, thanks to all those on the web who posted code for this). Once the value is selected, a second query is run using the site as the 'where' clause and the results are displayed back to the user. Any help for this mysql, php, htlm noob. I think once I get this bit, I'll be able to move forward with more interesting and complex code. TIA Doug ps - if this message shows up 3 times, my apologies but I've been having trouble posting. <html> <body> <?php // connect to db $db = mysql_connect("localhost"); mysql_select_db("test",$db); // build query $sitequery = "SELECT site from sitedata order by site"; // generate result set $siteresult = mysql_query($sitequery); // use results echo "Select a site from the list below: <br><br><select name='site'>"; while($siterow = mysql_fetch_array($siteresult))

    echo "<option value='".$siterow["site"]."'>".$siterow["site"]."</option>";

echo "</select></td>"; ?> </body> </html>