Rotating Banner Issue.

I plan on putting text below each of these small banners. It is more of a rotating advertisement for sold properties rather than banners but it works similarly.
The script I used was only set out for two banners (typical size) and I needed to modify it for five graphics. I managed to change the size appropriately and now they're rotating wonderfully, within frame. Of course this has only been tested in I.E.

Here's the problem: It rotates perfectly through images 1 - 5 and then skips to 2 and 4 and rotates between these two. This is where I am lost. I don't understand how to get it to continually rotate between the five images in succession. (1-5,1-5, etc)
Instead, it rotates images like this:
1,2,3,4,5,2,4,2,4,2,4..etc Code: