窗体关闭事件

                            window.onbeforeunload = function () {        

                         event.returnValue = "";                     

               }

                        window.onunload = function () {      

                        ifr_other.window.chaxun_onclick();                 

                   window.close();                              

               parent.document.getElementById("Button6").onclick;                     

        parent.onload();            

             }