function imagebackrotate(divID) {
 //preload the images
 var myimages = new Array();
 for (i=0;i<(imagerotate.length);i++) {
	myimages[i] = new Image();
	myimages[i].src = imagerotate[i];
  }
	setTimeout("changebackground('" + divID + "')", rotatespeed);
}
function changebackground(divID) {
	document.getElementById(divID).style.backgroundImage = "url(" + imagerotate[q] + ")";
	mainURL= imageURLrotate[q];
	q++;
	if (q>=imagerotate.length) {
		q=0;
	}
	setTimeout("changebackground('" + divID + "')", rotatespeed);
}