function validate_email(field,alerttxt)
		{
		with (field)
		  {
		  apos=value.indexOf("@");
		  dotpos=value.lastIndexOf(".");
		  if (apos<1||dotpos-apos<2)
		    {alert(alerttxt);return false;}
		  else {return true;}
		  }
		}
		
		function validate_form(thisform)
		{
		with (thisform)
		  {
		  if (validate_email(email,"Not a valid e-mail address!")==false)
		    {email.focus();return false;}
		  }
		}