How do you return to normal boot order?

[fishtornado]

I created a ubuntu live disc and tried it in my iMac. So I went into system preference=> start up disc and changed the boot order in order to test the disc. Now when I booted my computer this morning it automatically went to booting from the disc even when the disc was not in the drive. I thought it should have just gone back to booting from the hard drive. Does anyone know what I have to do in order to put the boot order back to mac hd?

 

[Hellhammer]

System Preferences > Startup Disk > Set the HD as #1 boot up volume