i used something like
document.getElementById("b1br").onclick = function () {
     document.getElementById("b1br").className += " MyClass2";

i used this after page loads but does not work? b1br element is above onclick assignment, well?

go here www.poliscarhire.com try book car when reach http://www.poliscarhire.com/customer...ing-review.php study source, the blue clickable divs are the ones mentioned, well? why no change??? R-click first div box and INSPECT ELEMENT why not applied .b3choosen class when clicked?