var position = 0;

function slide(direction,rowsize,rows) {
	var width = rowsize*rows;
	var start = position;
	if (direction=='next' && position>rowsize-width) {
		position -= rowsize;
	} else if (direction=='prev' && position<0) {
		position += rowsize;
	}
	//document.getElementById('logobar').style.marginTop = position+'px';
	t1 = new Tween(document.getElementById('logobar').style,'left',Tween.regularEaseInOut,start,position,1,'px');t1.start();
	
	if (position>=0) { document.getElementById('prev').className = 'off'; } else { document.getElementById('prev').className = 'on'; }
	if (position<=rowsize-width) { document.getElementById('next').className = 'off'; } else { document.getElementById('next').className = 'on'; }
}