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
		}
	}
}