Button reminds as clicked (i.e. in blue)

Button reminds as clicked (i.e. in blue)

Hi Forum;
 
I am using JQM 1.3.1. In my form I have the next button:
 
              <input type="button" id="but" value="Today">
 
When clicking this button, I need it to return to its default color, insted of blue, as it is down. I see this question in lots of places and the suggestion is always to do removeClass('ui-btn-active'), but in my case I tried it in lots of ways and never works. For example I did:
 
        $('#but').on('click', function(e) {
          setToday();
          $('#but').removeClass('ui-btn-active');
        });

I also did it the removeClass in a delayed even using setTimeout, but it also does not work. Any other idea will be appreciated, thank you!!!.
 
Adriano.