Passing a variable to JQuery()

Passing a variable to JQuery()

Total Noob question:

two objects on an html page. An event on object 1 effects object 2

  1.      $(".video_rg").mouseover(function(event){
             
            var myTriggerId = event.target.id;
            var myTargetId = 'video_' + myTriggerId;

            document.getElementById(myTargetId).src = 'images/test_object_2.gif'; // this works
           
    //        $('#myTargetId').src = 'images/test_object_2.gif'; // this does not
                      
           });








My assumption (we know about those) is that I am not passing the data to the $() function correctly, that it is reading '#myTargetId' as a string, and not a variable.  I just really want the JQuery code that would do what the document.getElementById code is doing.