function abrirPag(valor){var url=valor;xmlRequest.open("GET",url,true);xmlRequest.onreadystatechange=mudancaEstado;xmlRequest.send(null);if(xmlRequest.readyState==1){document.getElementById("centro").innerHTML="<div style='width:1024px; height:601px; background:url(images/back.jpg)'>Lendo...</div>";}return url;}function mudancaEstado(){if(xmlRequest.readyState==4){document.getElementById("centro").innerHTML=xmlRequest.responseText;}}