COOLjsMenu Professional can be used over form elements like SELECT and INPUT. Newer Gecko-based browsers (Mozilla, Mozilla Firefox, Netscape 6+) and Opera 7+ do not expose any issues. Internet Explorer disregards z-index and draws form elements in front of the menu, but for IE5.5+ there is a nice workaround (you don't have to do anything special to enable it - it just works).
For older browsers (Opera 5-6, Netscape 4.x) not so nice workaround available: form will be hiddent when user uses the menu. To turn this workaround on you have to wrap form with a DIV:
<div id="form1">
<form style="margin: 0">
...
</form>
</div>
Then all such DIVs must be mentioned in the configuration file, like in the following code snippet:
var MENU_ITEMS1 = [
{..., forms_to_hide:['form1'], ...},
Notice: nicer workaround for IE5.5+ cannot be used with filters and transitions because of platform limitations.