<img id="big-circle" src="images/pic2.jpg" alt=""/>其次在script代码段中加入如下代码，进行适量修改即可
$(document).ready(function () {
     var x = 10;
     var y = 20;
     $("#big-circle").mouseover(function (e) {
       var tooTip = "<div id='tooTip'><img src='" + this.href + "'></img><div>";
       $("body").append(tooTip);
       $("#tooTip").css({ position: "absolute",
         'top': (e.pageY + y) + "px", "left": (e.pageX + x) + "px"
       }).show("fast");
     }).mouseout(function () {
             $("#tooTip").remove();
     }).mousemove(function (e) {
       $("#tooTip").css({ position: "absolute",
         'top': (e.pageY + y) + "px", "left": (e.pageX + x) + "px"
       });
     });
   });