function validate_form(thisform,msg)
			{
				
				for(var i=0; i<thisform.length-1 ; i++)
				{
				
					if(!thisform[i].changed && thisform[i].name!="send")	{ alert(msg);  return false; }
				}
				
			 thisform.submit();
				
			}
			
			function change_field(field)
			{
				if(field.changed != true)
				 {
				 	
				 
				 field.old = field.value;
				 field.value = "";
				 
				 }
			}
			
			function change_back(field)
			{
				if(field.value == "") { field.changed =false; field.value = field.old; }
				else field.changed = true;
					
			}