function setFooterPos(){
	    $$('html').each(function(el){
		    var myimgsize = window.getScrollSize().y - 170;
		    el.setStyle('background-position','0 '+myimgsize+'px');
		});
	}

    window.addEvent('resize', function(){
		setFooterPos();
    });
    
    window.addEvent('domready', function(){
        setFooterPos();
    });