function doUnsubscribe(){
	document.subscribeForm.view.value = "unsubscribe";
	var objRegExp  = /^[a-z0-9]([a-z0-9_\-\.]*)@([a-z0-9_\-\.]*)(\.[a-z]{2,3}(\.[a-z]{2}){0,2})$/i;
	if(!objRegExp.test(document.subscribeForm.email_sbs.value)){
		var errMsg = document.getElementById("subscribe_err");
		errMsg.innerHTML = "Invalid e-mail address.";
		return;
	}
	document.subscribeForm.submit();
}