i have a table with say 45 columns & hence doesnot fit in a screen

when the user click on a table header i need to displaya div against that header which is done using jaava script

but i need it to appear as a menu and even if the table is scrolled the div shld move along with it

suppose a user clicks another column header the div shld appear at the clicked header place

and as there is only one div it shld move & be displayed as per the header column appearing as if a dropdown menu is getting dispalyed