//

// File:       utilities.js

//

// Abstract:   Sample utilities for JavaScript

//

// Version:    1.1

//

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//

Function.prototype.bind = function(thisObject)

{

    var func = this;

    var args = Array.prototype.slice.call(arguments, 1);

    return function() { return func.apply(thisObject, args.concat(Array.prototype.slice.call(arguments, 0))) };

}

/* ==================== Element Extensions ==================== */

Element.prototype.removeAllChildren = function ()

{

  while (this.firstChild) {

    this.removeChild(this.firstChild);

  }

};

/**

 *  Indicates whether the element has a given class name within its class attribute.

 */

Element.prototype.hasClassName = function (className) {

  return new RegExp('(?:^|\\s+)' + className + '(?:\\s+|$)').test(this.className);

};

/**

 *  Adds the given class name to the element's class attribute if it's not already there.

 */

Element.prototype.addClassName = function (className) {

  if (!this.hasClassName(className)) {

    this.className = [this.className, className].join(' ').replace(/^\s*|\s*$/g, "");

  }

};

/**

 *  Removes the given class name from the element's class attribute if it's there.

 */

Element.prototype.removeClassName = function (className) {

  if (this.hasClassName(className)) {

    var curClasses = this.className;

    this.className = curClasses.replace(new RegExp('(?:^|\\s+)' + className + '(?:\\s+|$)', 'g'), ' ').replace(/^\s*|\s*$/g, "");

  }

};