function checkVehiclesDetails( form )
{
	var vehicle1 = form.vehicle1.value;
	var vehicle2 = form.vehicle2.value;
	var vehicle3 = form.vehicle3.value;
	var vehicle4 = form.vehicle4.value;
	if( vehicle1 == "" && vehicle2 == "" && vehicle3 == "" && vehicle4 == "" )
	{
		alert( "Please select at least one vehicle.\n\nThank You" );
		return false;
	}
	return true;
}