var xmlHttp;
var objRetorno;

function createXMLHttpRequest(){	
    if (window.ActiveXObject){ // IE	
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

    }else if (window.XMLHttpRequest) { // Demais navegadores
        xmlHttp = new XMLHttpRequest();
    }
}

function atualizaImagem(){
    url = "validacao.jpg?sid="+new Date().getTime();
    createXMLHttpRequest();
    xmlHttp.open("GET", url, true);	
    xmlHttp.onreadystatechange = atualizandoImagem;
    xmlHttp.send(null);
}

function atualizandoImagem(){
    if (xmlHttp.readyState == 4){ //A??o Conclu?da
        if (xmlHttp.status == 200){//A??o Ok
            document.getElementById('form1:imagemValidacao').src = "validacao.jpg?sid="+new Date().getTime();
        }
   }
}

function abrirJanelaBancos() {
    window.open("Banco.html", "Bancos", 
        "scrollbars=no, status=no, menubar=no, toolbar=no, titlebar=yes, location=no, fullscreen=no, directories=no, " +
        "width=400, height=690, left=20, top=10, resizable=no"); 
}