function exibirAviso(){
	
	try { 
		clearInterval ( sessao );
	}
	catch (e) {};
	
	var objOverlay 	= document.getElementById('overlay');
	var objLogOut	= document.getElementById('aviso');
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	if (objLogOut) {
		objLogOut.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 350 - 300) / 2) + 'px');
		objLogOut.style.left = (((arrayPageSize[0] - 100 - 500) / 2) + 'px');
		objLogOut.style.display = 'block';
	}

	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';
	
}