var aB=new Array();
aB[0]=new Array('http://www.domain',0,0,'');
aB[1]=new Array('http://www.domain',0,0,'');
aB[2]=new Array('http://www.domain',0,0,'');
aB[3]=new Array('http://www.domain',0,0,'');
aB[4]=new Array('http://www.domain',0,0,'');
aB[5]=new Array('http://www.domain',0,0,'');

var nB=Math.floor(Math.random()*aB.length);
document.write('<img src="'+aB[nB][0]+'" width="'+aB[nB][1]+'" height="'+aB[nB][2]+'" border="0">');