You don't need any script for that since it is already basic behaviour of Plus!.
Turn on the option:
Plus! > Preferences > Messenger > Contacts on Desktop > Flash contact window on new message
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You can also select the color of the flashing:
http://www.msgpluslive.net/help/registry/ > FloatChatFlashColor
quote:
FloatChatFlashColor
Default: REG_DWORD
value: -1
Description: Color used to flash the background of floating contact windows. By default, the background color of the window is used to compute a darker or lighter color. This is a COLORREF value.
A COLORREF value is the hexadecimal representation of an RGB in the form RRGGBB, where RR is the hexadecimal value for the red component, GG for the green and BB for blue.
eg: white is: FFFFFF
black is: 000000
gray is: C0C0C0
red is: FF0000
blue is: 0000FF
yellow is: FFFF00
etc
Or use
Choli's Messenger Plus! Live Tweaker if you're not familiar with the registry.
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Also see "
CookieRevised's reply to Floating Contacts SNAPPING"
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