JSP masthead component in portal

Hi All,

I have a JSP component as the masthead in a AJAX Framework page. The masthead is 34px high and has a drop down menu on the top right hand corner.

When the user clicks on the drop down button, the masthead height is increased to render the drop down menu. This affects the overall UI.

How can i make the drop down menu to render without having the masthead height to increase?

Please see the images attached for the UI

css and html code also attached

thanks

Adnan