Occurs()

         Looks for the occurrences number into a string

    Syntax:

         Occurs( cString, cSearch ) -> nTimes

         cString : The string where look for
         cSearch : The sub-string to look for into cString

    Description:

         Returns the time number that cSearch is content into cString.
         The function is Case Sensitive.

    Return:

         The time number that cSearch is content into cString.

    Example:

         ? Occurs ( "Manu Roibal", "j" )   //  0
         ? Occurs ( "Manu Roibal", "A" )   //  0
         ? Occurs ( "Manu Roibal", "a" )   //  2