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,"Please enter a valid email address")==false)
			  	{email.focus();return false;}
				}
			}