<form name="ty" method="post"  autocomplete="OFF">     <select name="typex" id="typex" onChange="winOpen(document.ty.typex.value);">            <option value="a">a</option>
            <option value="1">1</option>        </select></form>function winOpen(Val){
if(Val!=""){
window.location.href="?typex="+Val;
}else{
return false;
}
}