customizing the progress bar

[aebstract]

Okay your basic code for a progress bar, will just use a bitmap and I assume show a % of it as the song plays. Is there any way to have say another image on top of that that displays and kinda slides along the bar at that percentage? So let's say my bitmap looks like this:

|----------|

and I have an image 'o' that I want to slide with the loader. So 20%:

|--o        |

70%

|-------o  |

etc.
Hope this makes sense. Thanks!



EDIT:
Okay, so I've done a little searching, and the only thing I am able to find so far is bar sliding. I am assuming you basically take like a circle bmp and it will slide alone the bar path? Could I possibly use a wide bmp and position it off the screen so that when it slides, it appears to be changing the image that it slides over. I may have a go at this and see how it turns out.

[tdtooke]

You could use the %px tag and some conditionals to display an image over your bar to kinda mimick a slider as time goes.  There was a patch that was specifically for exactly what you want to do, but it's been rejected.