function changeClassLevel01(obj)
{
obj.className = "level_01_over";
}

function restoreClassLevel01(obj)
{
obj.className = "level_01";
}

function changeClassLevel02(obj)
{
obj.className = "level_02_over";
}

function restoreClassLevel02(obj)
{
obj.className = "level_02";
}

function changeClassLevel03(obj)
{
obj.className = "level_03_over";
}

function restoreClassLevel03(obj)
{
obj.className = "level_03";
}