function el_pos(mode, el){
	var posy = 0;
	var posx = 0;
	var returner = 0;
	while (el != null) {
		posy += el.offsetTop;
		posx += el.offsetLeft;
		el = el.offsetParent;
	}
	
	if(mode == null || mode == 'top'){
		returner = posy;
	} else {
		returner = posx;
	}
	return returner;	
}