function IsEmail(address) {
	re = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	return address.search(re) == 0;
}

function IsBlank(value) {
	re = /^( )*$/;
	return value.search(re) == 0;
}