Così?
P75codice:<form name="form1" method="post" action=""> <select name="select" size="3" onChange="document.location=form1.select.value"> <option value="http://www.html.it">link1</option> <option value="http://www.tiscali.it">link2</option> <option value="http://www.google.it">link3</option> </select> </form>