Any thoughts on how check if a registry value is set...if so, I need to append to it with a string. Here is what I have so far.

Code:
 
$bbhome=ReadValue("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components\16FD58773EE02F44F9082F014DAF6CC9", "6BB86DA5D449506409F1448FC6560289")
 If @error <> 0
       ? "Error Encountered: " + @serror
       MessageBox("Can't find Big Brother install path!", $bbhome, 16)
       Exit 0
 Else
       $bbexternals = ReadValue ("HKEY_LOCAL_MACHINE\SOFTWARE\Quest Software\BigBrother\bbnt\Externals","")
       If @error = 0
             $bbfolder=$bbhome + "ext"
				 $bbhomeext=";" + $bbfolder + " /INT=300"
             If Not Exist($bbfolder)
                   MD $bbfolder
                   $ = updateregistry("HKEY_LOCAL_MACHINE\SOFTWARE\Quest Software\BigBrother\bbnt\Externals","",$bbhomeext,"REG_SZ")	                   
				 Else 
						 ?????
             EndIf
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