function colorBar(){
		var w = document.body.clientWidth;
		var h = document.body.clientHeight;
		var x = event.clientX;
		var y = event.clientY;
		if(x>w||y-3>h) 
			document.body.className='troca';
		else 
			document.body.className='normal';
	}

if (document.all)
{
document.body.className='normal';
document.onmousemove=colorBar;
}

function offscreen()
{
document.body.className='normal';
}

document.onmouseout=offscreen;