Loading bar

hi dudes and dudets, I have a quiery, im working with the tutorial http://www.kirupa.com/developer/mx/percentagepreloader.htm , and was wondering when i looked at the code, if it was possible to make the loadBar decrease in width than increase? it is frustrating as i think i know but don’t know quite how to put it in code lol. anyhow anyhelp would be appreciated.

p.s sorry if this is a simple question just it is late and im tired.