Gallery

I'm getting to a point where I may be thinking of switching Strange-Biros to another platform... I've been trying to make a Gallery page, but just can't get what I want... and that's strange as the very thing I want appears as part of the Picasa "organise" function... Basically I want something like a mosaic of the images in folder, BUT only on one page. If anyone knows how to do this, of can suggest a more flexible platform, then I'm interested.