function isEmail() {
	string = document.getElementById("txtEmail").value;

	if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
		return true;

	alert("Invalid Email!");
	return false;
}

function doSubmit() {
	if(isEmail()) 
		document.getElementById('form1').submit();
}