map的问题

Question

div id="contentRight"><div id="WMCtrWnd" style="display:block;"></div><div id="MapWnd" style="display:none;"><div style="text-align:center;width:780px><img src="images/map.png" width="780" height="760" border="0" usemap="#Map3" /></div></div> 
<map name="Map3" id="Map3">  <area id="shui1" shape="circle" coords="545,333,30" href="#self" onmouseover="info();" onmouseout="clearinfo();" onclick="func(this.id);"  onfocus="this.blur();" />
  <area id="shui2" shape="circle" coords="618,522,30" href="#self" onmouseover="info();" onmouseout="clearinfo();" onclick="func(this.id);"  onfocus="this.blur();" />
  <area id="shui3" shape="circle" coords="539,611,30" href="#self" onmouseover="info();" onmouseout="clearinfo();" onclick="func(this.id);"  onfocus="this.blur();" />
</map>代码运行正常，就是当鼠标在地图上移动频繁时，IE就没有了响应，资源占用100%,过好久才能恢复。
请问这应该怎么办？