How can i find out the size of a cell with javascript

Question

I have a popup that pops up right underneathe a so it looks like the (don\'t ask why). on 1024 *760 its the same width as the tab

Answer 1

jQuery is ideal if you can use it.

$('#popupId').width( $('#cellID').width() );

or you might need to use outerWidth(), depending on your needs.