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,fieldtovalidate)
{
	with (thisform)
	{
	if (validate_email(fieldtovalidate,"Not a valid e-mail address!")==false)
	  { return false;}
	}
}