I kinda like this one, as a "proper" Proper function will convert the first character or a word to uppercase and all other characters in the word to lowercase.

Code:

fnProper("hElLo ChRiS")
 

Function fnProper($String)
   $String = Split($String)
   For $i = 0 to Ubound($String)
      $String[$i] = UCase(Left($String[$i],1)) + LCase(SubStr($String[$i],2))
   Next
   $fnProper = Join($String)
EndFunction