change the opacity of a text

[khalil]

hello 
I used this JS code to change the objects to read only and change the opacity, but it didnt change the opacity of a text
how to make it work in text also

Code:

$(function(){
  grp.listen('32/1/1', function(object) {
     if (object.value == true ) {
        $(".lockbyknx").addClass("item-read-only");
         $(".lockbyknx").find('img').css("opacity", 0.5);
     } else if (object.value == false ) {
        $(".lockbyknx").removeClass("item-read-only");
         $(".lockbyknx").find('img').css("opacity", 1);
     }
  }, true); // set to true to send on same value
});