i just tried it out, it works in both netscape and IE, are u getting any errors or something ??
here is what i have
<form name="test_form" action="test_action.php">
<SELECT NAME="category" onChange="javascript:document.test_form.submit();">
<OPTION VALUE="0"> Select Category </OPTION>
<OPTION VALUE="1">A</OPTION> <OPTION VALUE="2">B</OPTION>
.
.
.
</SELECT>
</form>
reg
kevin