function validate_form() {
	if (document.thisform.workshop_name.value == "") {
		alert ("Please enter your name.");
		document.thisform.workshop_name.focus();
		return false;
	}
	if (document.thisform.workshop_phone.value == "") {
		alert ("Please enter your phone number.");
		document.thisform.workshop_phone.focus();
		return false;
	}
	if (document.thisform.workshop_address.value == "") {
		alert ("Please enter your mailing address.");
		document.thisform.workshop_address.focus();
		return false;
	}
	if (document.thisform.workshop_city.value == "") {
		alert ("Please enter your city.");
		document.thisform.workshop_city.focus();
		return false;
	}
	if (document.thisform.workshop_state.value == "") {
		alert ("Please enter your state.");
		document.thisform.workshop_state.focus();
		return false;
	}
	if (document.thisform.workshop_zip.value == "") {
		alert ("Please enter your zip code.");
		document.thisform.workshop_zip.focus();
		return false;
	}
	if (document.thisform.workshop_email.value == "") {
		alert ("Please enter your email address.");
		document.thisform.workshop_email.focus();
		return false;
	}
	if (isEmail(document.thisform.workshop_email.value) == false) {
		alert ("Please enter a valid email address.");
		document.thisform.workshop_email.focus();
		return false;
	}
	if (document.thisform.workshop_attendees.value == "") {
		alert ("Please enter the number of attendees.");
		document.thisform.workshop_attendees.focus();
		return false;
	}
	
	return true;
}

function isEmail(str) {
	var supported = 0;
	if (window.RegExp) {
		var tempStr = "a";
		var tempReg = new RegExp(tempStr);
		if (tempReg.test(tempStr))
			supported = 1;
	}
	if (!supported) 
		return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
	var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
	return (!r1.test(str) && r2.test(str));
}