Size of an image

I hope that I'm not too annoying on the forum, because as I see I'm actually the only one asking maybe newbie questions about xsl :)

My next problem is fitting an image to a page. I'm supposed to check the width of the image and compare it to the width of a page. Then, if the image is too wide I rotate it vertically and if not I do nothing. The problem is that I can't find a way of getting to the image size inside xsl. I was thinking of checking the size of created viewport but found nothing. 

Is any possibility to do this ?

I know that when using MSXSL I can use javascript. 

I thought of using some javascript with xml dom functions to do what I want. But I still can't find a solution. Maybe it's impossible ?

It would be a lot easier if I could do the transformation that I want inside my formatter, not using external app's that I can create using .NET and C#, because If I understood u correctly u mean smth like this.

Just to end the topic, correct me if I'm wrong, it's not possible to get the size of an image just using xsl or MSXSL <script> with JScript ?

The only thing that would do the job is that custom development added to your Formatter yes ?

PS: about the javascript and image size, I was fooled a little with javascript Image element, as it is only a HTML DOM refference so not available in my xsl's