DIV fits an image + left/right clickable zones (link)

Hello,
[B]A. CONTEXT[/B]
My album is generated by a batch script, but DOS cannot get the size of an image file. So, the a unique picture size is defined in the script.
[url]http://www.airfirst.ch/b1/album_im.html[/url] (IMAGE MAP version)
[url]http://www.airfirst.ch/b1/album_div.html[/url] (DIV version)

[B]B. NAVIGATION[/B]
– 2 half sensitive zones on each picture.
– Click on the left/right image side to go up/down.

[B]C. QUESTION[/B]
To avoid the problem with pictures having different size (pic. #2 [url]http://www.airfirst.ch/b1/PiCS/Pic002.JPG[/url] ),
how to make the DIV box to fit its content instead of using absolute value like:

[CODE]DIV.Box {position:relative;width:360Px;height:240Px;margin:10Px 0;}[/CODE]

?

PS: in my case, I use the image as backround of a DIV

Thanks and regards.

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