function DIVShow_a(e,i){
     var msg = document.getElementById(i);
     var hided  = ( msg.style.display == "none" );
     if( document.all)    // IE
     {
        msg.style.top = document.documentElement.scrollTop + event.clientY ;
        msg.style.left = document.documentElement.scrollLeft + event.clientX ; 
        msg.style.display = hided? "block" : "none";
     }
     else      // Firefox
     {
       // var evt = arguments[0];
        //alert(evt.clientY);
        e=e||event;    // ¼æÈÝÐÔ
        msg.style.top = document.documentElement.scrollTop + e.clientY + "px" ;
        msg.style.left = document.documentElement.scrollLeft + e.clientX + "px"; 
        msg.style.display = hided? "table-row" : "none";
     }
}