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 var divs = document.getElementById('goods_gallery').childNodes;
 var moving_item = null;
 for (var i = 0; i < divs.length; i++) {
	var div = divs[i];
	div.onselectstart = function() {return false;}
	div.onmousedown = function() {
		moving_item = this;
		return false;
	}
	div.onmousemove = function(evt) {
		evt = evt || event;
		if (moving_item && moving_item != this) {
			var pos = getPosition(this);
			var maxleft = pos.left + this.clientWidth / 2;
			if (evt.screenX < maxleft) {
				this.parentNode.insertBefore(moving_item, this);
			} else {
				if (this.nextSibling)
					if (this.nextSibling != moving_item) this.parentNode.insertBefore(moving_item, this.nextSibling);
				else
					this.parentNode.appendChild(moving_item);
			}
		}
	}
	div.onmouseup = function() {
		moving_item = null;
	}
 }