function setZoom(img, dir, width, height, margin, zIndex, delay) {
	setTimeout(function() {
		if (img.dir==dir) {
			img.style.width=width;
			img.style.height=height;
			img.style.margin=margin;
			img.style.zIndex=zIndex;
			img.parentNode.parentNode.style.zIndex=zIndex;
		}
	}, delay);
}
function larger(img, width, height) {
	img.dir='rtl';
	now=parseInt(img.style.zIndex);
	for (i=now+1; i<=10; i++) {
		w=(width*(10+i))/20+'px';
		h=(height*(10+i))/20+'px';
		m=(-i)+'px 0 0 '+(-width*i/40)+'px';
		setZoom(img, 'rtl', w, h, m, i, 20*(i-now));
	}
}
function smaller(img, width, height) {
	img.dir='ltr';
	now=parseInt(img.style.zIndex);
	for (i=now-1; i>=0; i--) {
		w=(width*(10+i))/20+'px';
		h=(height*(10+i))/20+'px';
		m=(-i)+'px 0 0 '+(-width*i/40)+'px';
		setZoom(img, 'ltr', w, h, m, i, 20*(now-i));
	}
}