function swap( imgname, imgfile )
{
	var source = "http://eeweb1.poly.edu/hpsr2007/images/" + imgfile;
	//var source = "images/" + imgfile;
	//var source = "file:///C:/Documents and Settings/Anusha/Desktop/myfolder/school/web team/img/images/" + imgfile;
	document.images[imgname].src = source;




}