function chk()
 {
  var d=document.frmSearch;
  if(d.make.value=="")
    {
	 alert("Please select the make");
	 d.make.focus();
	 return false;
	}
	
	if(d.model.value=="")
    {
	 alert("Please select the model");
	 d.model.focus();
	 return false;
	}
	
	if(d.service.value=="")
    {
	 alert("Please select the service interval");
	 d.service.focus();
	 return false;
	}
	
	
 }