Indexhibit Support

Hello...
I have searched the forum for an answer but I don't find anything...
I have a problem with a background image.
It works ok with a jpg file image, but not with a png. Can someone tell me why?
I have just tried what arsondpi says here for making my backgroung image fit all the size: indexhibit.org/forum/thread/16431/
It all works ok with a jpg, but nothing again with a png, so I guess I have something missed in my indexhibit...
The webpage I am trying to finish is this: sinforey.es
I need to put an image with trasparency in the main page, so that the background color also appears.
I would be very glad is someone of you could please help me.
Cheers,
Suc

Not sure - is the image huge? The address you posted doesn't seem to have a background image (jpg or png)

No, it has not any background image, because it does not work...
No, it is not huge, I have tryed with many sizes, even really small...