Hi,
This is just a thought, but have you considered just putting the "border" on the actual image and just using a rollover to change the images? Or, don't have the arrow there until the mouse is over the image then make the "arrowed" image the second image. Rollovers are very easy to do in Dreamweaver and will be consistent in all browsers. As long as the image files are small enough it will not be a problem for even dial-up users.
On a side note: personally, I hate when right-clicks are disabled. You force me to use your page a certain way (not being able to open links in new windows) and I would therefore probably leave the site for this reason. Just something to consider. Your page looks good though.
Shawn