function photoGallery(id, obj, width, height, delay) {
	this.id=id;
	this.width=width;
	this.height=height;
	this.delay=delay;
	this.images=Array();
	this.cnt=0;
	this.index=0;
	this.obj=obj;
	
	this.add = function(src) { this.images[this.cnt++] = src; }
	this.slide = function() {
		document.getElementById(this.id).src = this.images[this.index];
		this.index = (this.index+1)%this.cnt;
		setTimeout(this.obj+".slide()", this.delay);
	}
}