function fecha_aviso()
{
	document.getElementById('aviso').style.visibility='hidden';
	window.clearTimeout(timer);
}
function abre_aviso()
{
	document.getElementById('aviso').style.visibility='visible';
	timer=window.setTimeout('fecha_aviso()',40000);
}

png_fix = "*background-image: none; *filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src=postit.png,sizingMethod='scale');";
style = "<style>#aviso{position:absolute; left:40%; top:30%; width:312px; height:328px; background-image:url(aviso/postit.png); no-repeat; z-index:2; visibility: hidden;" + png_fix + "}</style>";

function escreve_aviso(texto)
{
	aviso = style + "<div id='aviso'><table width='100%' border='0' align='center' cellpadding='0' cellspacing='0'><tr><td><table width='312' height='328' border='0' align='center' cellpadding='0' cellspacing='0'><tr><td align='center' valign='center' width='312' height='328' class='texto_preto' style='padding-left: 10px; padding-right:35px; padding-top:110px; padding-bottom:20px'>" + texto + "<div id='fechar' style='position:absolute; right:0px; top:0px; width:50px; height:50px; z-index:2'><a href='javascript:fecha_aviso();'><img src='aviso/botao.gif' width='50' height='50' border='0'></a></div></td></tr></table></td></tr></table></div>";
	
	document.write(aviso);
}
function move_aviso(div)
{
	aviso = document.getElementById(div);
	aviso.style.top = document.body.scrollTop + (document.body.clientHeight * 0.30);
}
//onscroll="move_aviso('aviso')"