Need help with a sound mod =)

[:1]Hi, I'm trying to make a very simple sound mod that will play a sound clip whenever I cast Lava Burst and Thundstorm. This is what I have atm...

My .TOC


Code:

## Interface: 30200
## Title: Shaman Sounds
## Notes: Shaman Sounds
## Version: 1.0
## Author: Hayashi

ShamanSounds.lua
ShamanSounds.xml

My .XML


Code:

<Ui xsi:schemaLocation="http://www.blizzard.com/wow/ui/">
 <Script file="ShamanSounds.lua"/>
 <Frame name="ShamanSounds_Core">
  <Scripts>
   <OnLoad>
    self:RegisterEvent("UNIT_SPELLCAST_SUCCEEDED");  
   </OnLoad>
   <OnEvent> 
    Shaman_Sounds_OnEvent(event, arg1, arg2);
   </OnEvent>
  </Scripts>
 </Frame>
</Ui>

My .LUA


Code:

function Shaman_Sounds_OnEvent(event, arg1, arg2)
 local spellName = arg1
 if spell == GetSpellInfo(60043) then 
  if string.find(arg2, spell) and arg1 == "player" then
   PlaySoundFile("Interface\\AddOns\\ShamanSounds\\Sounds\\LavaBurst.mp3");
  end
 elseif spell == GetSpellInfo(59159) then
  if string.find(arg2, spell) and arg1 == "player" then
   PlaySoundFile("Interface\\AddOns\\ShamanSounds\\Sounds\\Thunderstorm.mp3");
  end
 end
end

Any ideas?

Thanks