var pic=new Array();

pic[0]="../img/Collage_Purple.jpg";

pic[1]="../img/Collage_Blue.jpg";

pic[2]="../img/Collage_Green.jpg";

pic[3]="../img/Collage_Yellow.jpg";


var whichpic = 0;

function rotateimg() {
    document.getElementById('CollagePic').src = pic[whichpic];
	
	whichpic = whichpic + 1;
	if(whichpic > 3){
		whichpic = 0;
	}
    setTimeout("rotateimg()", 4000);
}