function validate(valueToCheck){
		var alphanum=/^[0-9a-zA-Z]+$/;  // a-z, 0-9
		if(valueToCheck.match(alphanum)){
			return true;
		}else{
			return false;
		}
	}

	// simple email validation:
	function emailValidate(email) {
	    var lastAtPos = email.lastIndexOf('@');
	    var lastDotPos = email.lastIndexOf('.');
	    return (lastAtPos < lastDotPos && lastAtPos > 0 && email.indexOf('@@') == -1 && lastDotPos > 2 && (email.length - lastDotPos) > 2);
	}