sweet sweet relief
So I finally was able to get Gallery 1.5 to work with php5..*phew*, but then appeard to have some issues with the "block-random.php" file...turns out the php include statement needs a global reference rather than a local directory one.
So basically, i'm back to where I was earlier :)
As long as everythings working...plus the new gallery has some cool features like "drag and drop" file uploading...pretty cool actually!