Knowign the Y Position of a frame in to a frameset...

Hi To all the forum!!!
I have a question...
How i can do to know a top position of a frame in frameset...
independently from the resolution of Video mode???
I go to explain better...
i have a frameset with 3 frames... like this...
_______________________________ --> A

|
frame Top |
_______________________________ --> B
|
|
|
|
Frame Main |
|
|
gif_top |
_______________________________ --> C
gif_bottom |
Frame Bottom |
_______________________________ --> D

i have to put a gif splited in 2 part in the left bottom corner...
so i must slice the gif and put the upper part in the bottom of main
frame and put the lower part in the top of bottom frame...
....ok.. here we go!!!
to join the gifs i put it with 2 <img> tag ... 1 in the main frame and
one in the bottom frame..
- Mainframe :
<img src="IMG/sfondo_top.gif" style="position: absolute; left: 0px;
top: 275px">
- Bottom frame
<img src="IMG/Sfondo_bottom.gif" style="position: absolute; left: 0px;
top: 0px">
ok... but this solution work only if in one video mode.. (es.
1024X768) and without auto hide of Application bar!!!
I need to know how to know the top position (the Y position inside
video) of the bottom frame... where is placed the C line..
so i know the height of my gif and i can place her Top =
Cposition-Height_of_my_Gif....
Need help to resolve this problem...
really thanks to everybody..
bye bye.. stefano.. Have a nice day... or night :-) from italy!!