original_GetTradeSkillInfo = GetTradeSkillInfo;

function GetTradeSkillInfo ($a1, $a2, $a3, $a4, $a5, $a6, $a7, $a8, $a9, $a10 )
   do yammy stuff
   return original_GetTradeSkillInfo($a1, $a2, $a3, $a4, $a5, $a6, $a7, $a8, $a9, $a10)
end