var changeSpeed = 5000;
var crossFadeDuration = 3;

var Pic = new Array();
Pic[0] = '../../_layout/ads_oil-spill_a.png'
Pic[1] = '../../_layout/ads_oil-spill_b.png'

var PicTarget = new Array();
PicTarget[0] = 'http://www.developers-fight-the-oil-spill.com/'
PicTarget[1] = 'http://www.developers-fight-the-oil-spill.com/'

var t;
var j = 0; //Math.floor(Math.random()*4)
var p = Pic.length;
var preLoad = new Array();

for (i = 0; i < p; i++) {

	preLoad[i] = new Image();
	preLoad[i].src = Pic[i];
}

function runAds() {

	document.images.ads.src = preLoad[j].src;
	document.links.ads.href = PicTarget[j];

	j = j + 1;

	if (j > (p - 1)) j = 0;

	t = setTimeout('runAds()', changeSpeed);

}