window.addEvent("load",function(){
	var rozmiary = $("zawartosc-pion").getScrollSize();
	var roz = $("suwak-pion").getSize();
	
	if(rozmiary.y <= roz.y)
	{
		$('suwak-pion').setStyle('display', 'none');
	}
	else
	{
	wys = Math.round((roz.y/rozmiary.y)*roz.y);
				
	s = (rozmiary.y/15).round();

	$('suwaka').setStyle('height', wys);

	var pasek = new Slider('suwak-pion','suwaka',{
		steps: s,
		mode: "vertical",
		wheel: true,
		onChange: function(step){
			$("zawartosc-pion").scrollTo(0,step*10);
		}
	}).set(0);
				
	$('zawartosc-pion').addEvent("mousewheel", function(evnt){
		var step = pasek.step - evnt.wheel * 10;	
		pasek.set(step);    				
	});
	}
});