/*

String class written by Dan Stewart
---------------------------------------*/

function checkForm() {
	if (emailCheck(document.getElementById("txt-email").value) == false) {
		document.getElementById("email-error").style.display = "block";
	} else {
		document.getElementById("email-error").style.display = "none";
		var form = document.getElementById("sign-up");
		form.submit();
	}
}

function regExTest(rule, value) {
	return rule.test(value);
}

function emailCheck(value) {
	var regExpr = /^[_a-z0-9-]+(\.[_a-z0-9-]+)*@([a-z0-9])(([a-z0-9-])*([a-z0-9]))+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$/
	return regExTest(regExpr,value);
};