Image preloader is not a function primitive. It is a technique for making the browser download the images to the local cache before they are needed, so when you do change the .src the browser will quickly display from the cache rather than making the user wait for the image to download from the server. The local cache is probably not even in RAM. Unless your 200 images are incredibly large, the user probably has enough disk space to hold those images. On Thu, 20 Jul 2006 13:48:33 +0100 (BST) suresh kumar <asureshkumar_1983 at yahoo.co.in> wrote: > I want to know how Image preloader function works, and is there any other solution other >than what i specified above.i also want to know whether the user want to have large RAM size for >storing image.