According to this article at http://www.tiscali.co.uk/reference/encyclopaedia/countryfacts/lebanon_flag.html
the colors in Lebanon's flag represent:
 
"Red is said to stand for bloodshed. White represents peace, holiness, and eternity." (Of course, green is the green cedar tree of Lebanon which grows there, but the colors red representing bloodshed, and white representing peace, holiness, & eternity are totally opposite and would represent opposition.)