function validate_required(field,alerttxt)
	{
	with (field)
	{
	if (value==null||value=="")
	  {alert(alerttxt);return false;}
	else {return true}
	}
	}
	
	function validate_form(thisform)
	{
		with (thisform)
		{
			if (validate_required(email,"Email must be filled out!")==false)
			  {email.focus();return false;}
			
			if (validate_required(firstname,"First name must be filled out!")==false)
			  {firstname.focus();return false;}  
			  
		    if (validate_required(firstname,"Last name must be filled out!")==false)
			  {lastname.focus();return false;}    
			
			if (validate_required(city,"Citymust be filled out!")==false)
			  {city.focus();return false;}    
		}
	}