Limit GUICreateInput to Three Characters?

[AramisResearch]

I have the following chunk of code:

$AdminIP = GUICtrlCreateLabel("Backup LAN IP", 5, 245, 175, 18)
    $Input_BackupIPOct1 = GUICtrlCreateInput("", 95, 245, 30, 18, $ES_NUMBER)
    $Dot1 = GUICtrlCreateLabel(".", 130, 245, 10, 18)
    $Input_BackupIPOct2 = GUICtrlCreateInput("", 135, 245, 30, 18, $ES_NUMBER)
    $Dot2 = GUICtrlCreateLabel(".", 170, 245, 10, 18)
    $Input_BackupIPOct3 = GUICtrlCreateInput("", 175, 245, 30, 18, $ES_NUMBER)
    $Dot3 = GUICtrlCreateLabel(".", 210, 245, 10, 18)
    $Input_BackupIPOct4 = GUICtrlCreateInput("", 215, 245, 30, 18, $ES_NUMBER)

It puts up four little boxes separated by three dots, each box for one octet of an IP address. I would like to make it do the following:

• Limit the number of characters a user can enter to three characters.
• Accept the "." character as equivalent to TAB to change fields.

Any suggestions here?

Thanks,

-Chris

[GaryFrost]

start with GUICtrlSetLimit from the help

you might want to look at the Gui IP Address Control