Assume the web page contains the following code

1. <div style="height: 80px; padding:10px 0;">
   ....
   </div>

Now I want to replace the 80px value by a 50px value.

How can I achieve this for a) the first occurency and b) for all occurencies?

The following does not work:

1. $("div[style='height: 80px;'").css("height","50px");