Array.prototype.hasValue = function(value) {
    for (var i=0; i<this.length; i++) {
        if (this[i] == value) { return true; }
    }
    return false;
}
function hasClassName(obj, className) {
    return obj.className.split(' ').hasValue(className);
}
function addClassName(obj, className) {
    if (!hasClassName(obj, className)) {
       obj.className = obj.className + ' ' + className; 
    }
}


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