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<html> <head> <script type="text/javascript"> function changeLink() { document.getElementById('venus').href="http://www.w3school.com.cn" } </script> </head> <body> <img src="planets.gif" width="145" height="126" usemap="#planetmap" /> <map name="planetmap"> <area id="venus" shape="circle" coords="124,58,8" alt="Venus" href="venus.htm" /> </map> <input type="button" onclick="changeLink()" value="Change link" /> </body> </html>