Hi Roopa,
As i understood it doesn't depend on the value you selected from the list.Whatever the selection may be it should submit to the same page isn't it ?.
It's very simple
write a javascript function in <HEAD> part of your page
function getNew()
{
document.formname.submit();
}
Note: formname is the name of your form
Call this function on onChange() event of LIST i.e <SELECT name="" onChange="getNew()">
Cheers
Ajay