var width   = "475";        // Width of Advertisements
var height  = "103";         // Height of Advertisements 
var target  = "_blank";     // Target window to open the ads

var ad      = new Array()
 // Write down the source urls of ad images
 ad[0]='http://www.5chicago.com/campaigns/chicagohousefm.jpg';

var links   = new Array()
 //Write link to ads respectively
 links[0]='http://www.chicagohousefm.com/';

var s       = Math.floor(Math.random()*ad.length);
document.write('<a href="'+links[s]+'" target="'+target+'"><img src="'+ad+'" width="'+width+'" height="'+height+'" border="0" alt="'+links[s]+'"></a>');