if (document.images) {

	flag = false;
	img = new Array;	
	img.name = new Array("","thee","koffie","galerie");
	mem = new Number;
	
	for (x=1; x<4; x++) {
		img[x] = new Image();
		img[x].hi = new Image();
		img[x].lo = new Image();
		img[x].memhi = new Image();
		img[x].memlo = new Image();
		
		img[x].memlo.src = img[x].src = "/images/" + img.name[x] + ".gif";
		img[x].memhi.src = img[x].hi.src = "/images/" + img.name[x] + "_hi.gif";
		img[x].lo.src = "/images/" + img.name[x] + "_hi.gif";

	}
	
	function Swap(n) {
		if (mem > 0) {
			img[mem].src = img[mem].memlo.src;
			img[mem].hi.src = img[mem].memhi.src;
			Off(mem);
		}
		img[n].src = img[n].hi.src = img[n].lo.src;
		On(n);
		mem = n;
	}

	function On(n) {
		name = img.name[n];
		if(document[name].src == img[n].hi.src){
		  flag = true;
		} else {
		  flag = false;
		  document[name].src = img[n].hi.src;
		}  
	}
	
	function Off(n) {
		name = img.name[n];
		if(!flag) {
		  document[name].src = img[n].src;
	  }
	}
}