<script language="javascript" type="text/javascript"> if (document.images) { image1 = new Image image2 = new Image image1.src = "pic1.jpg" image2.src = "pic2.jpg" } </script> <a href="" onmouseover="document.pic.src=image2.src" onmouseout="document.pic.src=image1.src" >Picture</a> <a href="" onmouseover="document.pic.src=image2.src" onmouseout="document.pic.src=image1.src"><img src="pic1.jpg" name="pic" /></a>
<a href="" onmouseover="document.getElementById('pic').src=image2.src" onmouseout="document.getElementById('pic').src=image1.src"><img src="pic1.jpg" id="pic" /></a>
var p=document.getElementById('pic'); /* and then refer to it as */ p.src='newvalue';