function checkEmail(string) {
    var re = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
    if (!string.match(re)) {
        return false;
    } else {
        return true;
    }
} 

function validateSignup(obj) {
	var error = false;
	if (!checkEmail(obj.email.value)) {
		document.getElementById('signupError').style.display = "inline";
		obj.email.select();
		obj.email.focus();
		return false;		
	} else {
		return true;
	}

}