function numeros(){ 
   var tecla = event.keyCode;
   if(tecla >= 48 && tecla <= 57){
      return true; 
   } else {
      return false;
   }
 }
 function openAjax(){
   var ajax; 
     try {
        // Firefox, Opera 8.0+, Safari
        ajax=new XMLHttpRequest();
     }
     catch (e){
        // Internet Explorer
        try {
          ajax=new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
              ajax=new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {
              alert("Seu navegador não suporta AJAX!");
              return false;
            }
        }
     }
     return ajax;
 }
 function ValidaEmail(){             
   var txt = document.getElementById("EMAIL").value;
   if ((txt.length != 0) && ((txt.indexOf("@") < 1) || (txt.indexOf('.') < 7)))
   {  
      document.getElementById("EMAIL").value = 'Email Invalido!!!!';
      document.getElementById("EMAIL").style.color="red";
      return false;
   } else {
      document.getElementById("EMAIL").style.color="#585858";
      return true;
   }
 }