//**´íÎóÌáʾ¿ØÖÆ´úÂë**//
function myTip(){
    var myd=document.getElementById("mydiv");
        myd.style.left=event.clientX+15;
        myd.style.top=event.clientY+15;
        myd.style.visibility="visible";
}
function myhid(){
  var myd=document.getElementById("mydiv");
      myd.style.visibility="hidden";
}