Changing sidebar

<script language="JavaScript">
<!--

/*
Random Image Script- By JavaScript Kit (http://www.javascriptkit.com)
Over 400+ free JavaScripts here!
Keep this notice intact please
*/

function random_imglink(){
var myimages=new Array()
myimages[0]="image1.gif"
myimages[1]="image2.gif"
myimages[2]="image3.gif"
myimages[3]="image4.gif"
myimages[4]="image5.gif"
myimages[5]="image6.gif"

var ry=Math.floor(Math.random()*myimages.length)
document.write('<img src="'+myimages[ry]+'" border=0>')
}
random_imglink()
//-->
</script>