LinkDock
The magnification effect works in Firefox, Mozilla, Opera, Safari and Internet Explorer.
When you hover over an image, a description text is displayed in the center under the links. This provides a way to help describe where the link goes. The script also allows a default text to be used when the links are not hovered on. This can be turned off for all links via a variable in the script. Plus, you can use an empty string for links that you do not want any descriptive text under. The color, size, style, and weight of this text (when enabled) is controlled by a style-sheet string variable in the script.
When a browser is used that supports the magnification effect, you will notice the horizontal space required is somewhat wider than the menu normally needs. This is to give room when the icons are magnified so as not to cause the rest of your page's content to shift.
Due to the way browsers resize images, you'll notice that as the icons are magnified, there will be some "jaggies" on any diagonal edges or arcs. To minimize this, try to use images that have vertical or horizontal lines only. Slightly blurring the image sometimes helps too. Because the images seem to scale down better than scale up, I would recommend making the images themselves as big as the largest magnification value.
The images themselves should be created to have perfectly square dimensions (100x100, 30x30, etc). If not, they will appear incorrect when using the menu. To add spaces between each icon, simply add a bit of whitespace on the right and left edges of your images. The menu will let you use pretty much any type of browser supported graphic (GIF, JPG, PNG, etc).