// Set speed (milliseconds)
var speed = 3500
// Specify the image files
var Pic = [];

function loadImages() {
	   for (i in Pic){
		   var currentPic = Pic[i];
		   // transformamos a imagen
		   for(j = 0; j < currentPic.length; j++) {
			var imgtmp = currentPic[j][0];
			currentPic[j][0] = new Image();
			currentPic[j][0].src = imgtmp;
			currentPic[j][0].border = 0;
   	   }
   }
}

function switchImg(id){
	var div = document.getElementById(id);
	var anchor = div.firstChild;
	var images = Pic[id];
	var k;
	if(div && anchor) {
		k = div['imgIndex'];
		if(!k) {
			k = 0;
		}

		if(k > images.length - 1){
			k = 0;
		}
		if(anchor.firstChild) {
			anchor.removeChild(anchor.firstChild);
		}
		anchor.appendChild(images[k][0]);
		anchor.href = images[k++][1];
		div['imgIndex'] = k;

		var t = setTimeout("switchImg('" + id + "')", speed);
	}				
}

function startSwitch() {
   var a;
   if (document.images){
	for(a in Pic) {
		switchImg(a);
	}
   }
}