JQuery: Appending Attribute Value to Each Element

Try:

$("img").each(function () {
    var originalSrc = $(this).attr('src');
    $(this).attr('src', 'http://www.domain-name.com/' + originalSrc);    
});

Even less work with (compare http://api.jquery.com/attr/) :

$("img").attr('src', function(i, val){
   return 'http://www.domain.com/' + val;
});

$("a").attr('href', function(i, val){
   return 'http://www.domain.com/' + val;
});

Greets