function doYes(form) {
	var pickup = form1.pickup.value
	var destination = form1.destination.value
	var vehicle = form1.vehicle.value
	var loc = new String ( pickup + "_" + destination + "_" + vehicle + ".html")
	if (pickup == destination)
	{ 
	alert("select different start and end point"); 
	return false;
	}
	if (pickup == '')
	{
	alert("please selection a pickup point");
	return false;
	}
	if (destination == '')
	{
	alert("please selection a destination location");
	return false;
	}
	if (vehicle == '')
	{
	alert("please selection a vehicle");
	return false;
	}
	else
    //document.forms[0].action = loc;
	document.forms[0].action = vehicle + ".asp";
	document.forms[0].method = "post";
	document.forms[0].submit();
    }