Running MBP with Snow Leopard 10.6.8. - Non Visible Dock Icons

Several Apple Applications are no longer visible on the Dock. They haven't disappeared - they are there, but there is a blank space where they are. If I open one, there is a blue dot underneath it.
Removing from Dock and returning it there and saying keep in dock do nothing.
They are there, just not visible. There is a blank space in between Icons.
In between Address Book and iTunes is where iChat is.
The specific ones ore iChat and TextEdit - so far.
Can someone help?
Thanks, Brad

Several Apple Applications are no longer visible on the Dock.
What were you doing when you noticed that your icons became invisible?
Disconnect all peripherals from your computer. Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
Restart your computer when done.
Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751 and restart your computer.

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