function Mascarar_Data(keypress, objeto)
{
	campo = eval (objeto);
	caracteres = '1234567890';
	if ((caracteres.search(String.fromCharCode (keypress)) == -1) || (keypress == 36) || (keypress == 41) || (keypress == 46) || (keypress == 94) || (keypress == 124)) {
		event.returnValue = false;
	}
	else {
		if (campo.value.length == 2 ) { 
	 		campo.value = campo.value;
	 		campo.value = campo.value + '/';
		}
		if (campo.value.length == 5 ) { 
	 		campo.value = campo.value;
	 		campo.value = campo.value + '/';
		}
	}
}