I register this function to the Object prototype:

Object.prototype.length = function () {
    var length = 0;
    for (var i in this) length++;
    return length - 1;
};

when i use the css function, it runs this line:

name = name.replace(rupper, "-$1").toLowerCase();

but the variable 'name' is the 'length' function(above), not a string.