este es mi funcion:
<script LANGUAGE="javascript">
<!--
var ret;
function mandar()
{
ret=true
if (document.getElementById('categoria').selectedInde x==0)
{
alert("Please select one option");
document.getElementById('categoria').focus();
ret=false;
}
return ret;
}
//-->
</script>
y este es el form:
<form action="list_works.asp" method="post" name="form1" onsubmit="return mandar();">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td><select name="categoria" id="categoria">
<option value="0" selected>> I´m looking for...</option>
<%
Do while not rx.eof%>
<option value=<%=rx("id_categories")%>><%=rx("name_Categor ies")%></option>
<%
rx.movenext
loop
%>
</select></td>
<td><input type="submit" name="Submit" value="Go"></td>
</tr>
</table>