function changeMenu(obj){
  eval("self.location='?y="+obj.options[obj.selectedIndex].value+"'");
}

function changeFolioMenu(obj){
  var c=document.psearch.c.options[document.psearch.c.selectedIndex].value;
  var m=document.psearch.m.options[document.psearch.m.selectedIndex].value;
  var s=document.psearch.s.options[document.psearch.s.selectedIndex].value;
  var y=document.psearch.y.options[document.psearch.y.selectedIndex].value;
  eval("self.location='?c="+c+"&m="+m+"&s="+s+"&y="+y+"'");
}