// Form validation
// check for empty strings
		function isEmpty(field) {
		  if (field.value == "") {
 			 requiredFields = requiredFields+field.name+"\n";
 			 valid = false;
			 return false;
		  }
		  return true;
		}
		
		function checkSelect(field) {
			if (field.selectedIndex == 0) {
 			 requiredFields = requiredFields+field.name+"\n";
 			 valid = false;
 			 return false;
		  }
		  return true;
		}



// this function checks the entire form
		function fullCheckContactUs(theForm) {
			requiredFields = "";
			valid = true;
			isEmpty(theForm.elements['fullname']);
			isEmpty(theForm.elements['email']);
			isEmpty(theForm.elements['subject']);
			isEmpty(theForm.elements['message']);						
			if (valid) {
				return true;
			} else {
				alert("Please specify values\nfor the following fields:\n\n"+requiredFields);
				return false;
			}
		}