function checkForm() {

	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

	var name = document.contact.name.value;
	var email = document.contact.email.value;
	var phone = document.contact.phone.value;


	if( (name == null) || (name == "") ){
	    alert("Please enter your name.");
	    return false;
	}else if( ((phone == null) || (phone == ""))  &&  ((email == null) || (email == ""))  ){
	    alert("Please fill out either your phone number or email address.");
	    return false;
	}else if (!filter.test(email) && email.length > 0){
	    alert("Please enter a valid email address.");
	    return false;
	}else{
	    return true;
	}

}