preload('aboutBtn','images/about_off.gif');
preload('aboutBtn_roll','images/about_on.gif');
preload('prevBtn','images/prev_off.gif');
preload('prevBtn_roll','images/prev_on.gif');
preload('nextBtn','images/next_off.gif');
preload('nextBtn_roll','images/next_on.gif');

function preload(imgObj,imgSrc)
	{
	eval(imgObj+' = new Image()');
	eval(imgObj+'.src = "'+imgSrc+'"');
	}