var randomimageselect = new Array('http://www.buildstore.co.uk/affiliatewiz/aw.aspx?B=177&A=71','http://www.buildstore.co.uk/affiliatewiz/aw.aspx?B=154&A=71','http://www.buildstore.co.uk/affiliatewiz/aw.aspx?B=177&A=71','http://www.buildstore.co.uk/affiliatewiz/aw.aspx?B=154&A=71');
var max = randomimageselect.length;
var num = Math.floor((Math.random() * max));
document.writeln("<a href='" + randomimageselect[num] + "&Task=Click' Target='_Blank'><img border='0' src='" + randomimageselect[num] + "&Task=Get' alt='National Self Build &amp; Renovation Centre' width='585' height='75' style='margin-left:100px;' /></a>");