To install this mod:
-Locate your minecraft.jar file. For windows vista/7:
    "C:\Users\[username]\AppData\Roaming\.minecraft\bin"
-Use winrar or 7zip or any other archiver to open said file
-Place the class files in the "add-to-minecraft-jar" folder into the .jar file
-OPTIONAL: Copy the terrain.png into the .jar file. This will make ice more see-through, so ice can be used as windows.
-DELETE THE META-INF FOLDER FROM THE .JAR FILE!!!!
-Play!!!!