function _getUrlParam(name){
    var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
    var r = window.location.search.substr(1).match(reg);
    if(r!=null)return unescape(r[2]); return null;
}
$(function(){
    var messageKey = _getUrlParam("_k");
    $.post('mMessageController.do?user_preview',{'k':messageKey,'readOnly':true},function(){});
});