function validate_email_form(form) {
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	var alertlist = "";
	var alertlist_count = 1;

	//email field
	if (form.email.value == "") {
		alertlist += alertlist_count++ + ". Please enter your email.\n";
		form.email.focus();
	} else 	if (!filter.test(form.email.value)){
		alertlist += alertlist_count++ + ". You have entered an invalid email.\n";
		form.email.focus();
	}
	
	if (alertlist != "") {
		alert (alertlist);
		return false;
	} else {
		return true;	
	}
}

function bookingSubmitOn() { 
	$("formsubmit").className = "formsubmit_bg_on";
}
function bookingSubmitOff() {
	$("formsubmit").className = "formsubmit_bg";
}