in the next examples :
 <b id="TITLE">The%20Vampire%20Diaries</b>
 <b id="TITLE"> How%20I%20met%20your%20moom</b>
how can i replace all %20 with " "(space) in all the names that a contained in id="TITle" ?
in the next examples :
 <b id="TITLE">The%20Vampire%20Diaries</b>
 <b id="TITLE"> How%20I%20met%20your%20moom</b>
how can i replace all %20 with " "(space) in all the names that a contained in id="TITle" ?
 
    
     
    
    Use unescape():
$("#TITLE").text(function(i,v){
    return unescape(v);
});
Live Demo: http://jsfiddle.net/rm8GU/1
FYI: In case both elements in your example exist in the same document, ID should be unique, and you should use class references instead.
 
    
    You shouldn't have 2 items with the same ID. Try using a class instead, then iterating the classes.
$('.TITLE').each(function(){
    $(this).text(unescape($(this).text()));
});
 
    
    $('b').each(function (i) {
if ($(this).id=='Title');
{ $(this).text($(this).text().replace("%20", " "));
}
});
