Simple plain javascript object clone (not fully tested but it does as much as I need!).

function cloneObject

function cloneObject(objectToClone) {
    var key, i, clonedArray = [];
    var clone = {};
    if(typeof objectToClone == "object") {
        if(objectToClone.length == undefined) {
            for(key in objectToClone){
                clone[key] = cloneObject(objectToClone[key]);
            }
        } else { // we're an array or string
            clone = objectToClone.slice(0)
            for(i = 0; i < clone.length; i++) {
                clone[i] = cloneObject(clone[i]);
            }
        }
    } else { // we're a number or some other basic datatype
        clone = objectToClone;
    }
    return clone;
}