//<![CDATA[
function confirmar(mensaje) {
    var yesNo = true;
    var answer = confirm(mensaje);
    if (!answer) {
        yesNo = false;
    }
    else {
        this.disabled = true;
    }
    //var theForm= document.forms['__aspnetForm'];				
    //theForm.onsubmit="";
    return yesNo;
    e.returnValue = yesNo;
}

//]]>