var image_h1='<a href="img/home/big-ad1.jpg" rel="lightbox"><img src="img/home/small-ad1.jpg" border="0" width="216" height="173" /></a>';
var image_h2='<a href="img/home/big-ad2.jpg" rel="lightbox"><img src="img/home/small-ad2.jpg" border="0"  width="216" height="173"/></a>';
var posNr=Math.floor(Math.random()*2+1);
document.write(eval('image_h'+posNr));