<!DOCTYPE html>
<html>
<body>
<img src="planets.gif" width="145" height="126" usemap="#planetmap">
<map name="planetmap">
<area id="venus" target="_blank" shape="circle" coords="124,58,8" alt="Venus" href="venus.htm-id=searchtest.html">
</map>
<p>Click the button to change the querystring part of the href attribute for the "venus" area in the image-map.</p>
<p><b>Tip:</b> Open the link and look in the address bar before and after you have clicked the "Try it" button, to see the effect.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("venus").search = "somenewsearchvalue";
document.getElementById("demo").innerHTML = "The querystring part was changed from 'searchtest' to 'somenewsearchvalue'.";
}
</script>
</body>
</html>