issue for making javascript for FF

currently lots of things r done but with some issues hope it gets cleared 1) FF issue i mean the script that i have doesnot work with FF 2)i have a grid with few columns & the grid has scroll bar the grid does not fit in one screen so need to scroll the browser when a grid header column is clicked a div control gets displayed nr that column & works fine with browser scroll when the browser is scrolled the div control moves with the column but if i use the grid scroll bar the div control doesnot move with the column hope the query/issues r clear