<SCRIPT LANGUAGE="JavaScript">
function mascara_data(obj, tecla){
if (tecla.keyCode == 8)
	return true; 
var continuar = false;	  
if ((tecla.keyCode >= 48) && (tecla.keyCode <= 57)){
	continuar = true;
}
if ((tecla.keyCode >= 96) && (tecla.keyCode <= 105)){
	continuar = true;
}
if ((tecla.keyCode == 46) || (tecla.keyCode == 8)){
	continuar = true;
}
if (continuar == false)
	return false;
vlr = obj.value;
vlr2 = "";
vlr = vlr.replace("/","");
vlr = vlr.replace("/","");
vlr2 = vlr2 + vlr.substr(0,2);
if (vlr.length >= 2) 
	vlr2 = vlr2 + "/";
	vlr2 = vlr2 + vlr.substr(2,2);
if (vlr.length >= 4) 
	vlr2 = vlr2 +"/";
vlr2 = vlr2 + vlr.substr(4,4);
obj.value = vlr2;
	return true;
}
</script>