function validaEmail(oEvent) {
    oEvent = oEvent || window.event;
    var Campo = oEvent.target || oEvent.srcElement;
    var oXHR = zXmlHttp.createRequest();
	
    oXHR.open("get", "ajax.php?" + Campo.name + "=" + encodeURIComponent(Campo.value), true);
    oXHR.onreadystatechange = function () {
        if (oXHR.readyState == 4) {
            if (oXHR.status == 200) {
                var arrInfo = oXHR.responseText.split("||");
                
                if (!eval(arrInfo[0])) {
					if (arrInfo[1]=="1"){
						var divEmailValido = document.getElementById("divEmailValido");
						divEmailValido.style.display="none";
						
						var divEmailInvalido = document.getElementById("divEmailInvalido");
						divEmailInvalido.style.display="block";
					}
					
					
					Campo.value="";
					Campo.focus();									
                } else {
					
					var divEmailValido = document.getElementById("divEmailValido");
					divEmailValido.style.display="block";
						
					var divEmailInvalido = document.getElementById("divEmailInvalido");
					divEmailInvalido.style.display="none";
				}
            } else {
                alert("Erro na ligacao ao servidor.");
            }
        }
    };
    oXHR.send(null);
};