/* $id: global.js 15469 2008-12-19 06:34:44z testyang $ */
object.extend = function(destination, source)
{
  for (property in source) {
    destination[property] = source[property];
  }
  return destination;
}
/*
object.prototype.extend = function(object)
{
  return object.extend.apply(this, [this, object]);
}
*/

//封装geteelementbyid函数
function $e()
{
  var elements = new array();
  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getelementbyid(element);

    if (arguments.length == 1)
      return element;

    elements.push(element);
  }

  return elements;
}

//创建元素
function $ce(tagname)
{
    return document.createelement(tagname);
}

//定义类类型
var class = {
  create : function()
  {
    return function()
    {
      this.initialize.apply(this, arguments);
    }
  }
}

//对象绑定
function.prototype.bind = function(object) {
  var __method = this;
  return function()
  {
    __method.apply(object, arguments);
  }
}

if (!window.event) {
  var event = new object();
}

object.extend(event, {
  element: function(event) {
    return event.target || event.srcelement;
  },

  pointerx: function(event) {
    return event.pagex || (event.clientx +
      (document.documentelement.scrollleft || document.body.scrollleft));
  },

  pointery: function(event) {
    return event.pagey || (event.clienty +
      (document.documentelement.scrolltop || document.body.scrolltop));
  },

  stop: function(event) {
    if (event.preventdefault) {
      event.preventdefault();
      event.stoppropagation();
    } else {
      event.returnvalue = false;
    }
  },

  position: function(element)
  {
    var t = element.offsettop;
    var l = element.offsetleft;
    while(element = element.offsetparent)
    {
        t += element.offsettop;
        l += element.offsetleft;
    }
    var pos={top:t,left:l};
    return pos;
  } ,

  observers: false,

  _observeandcache: function(element, name, observer, usecapture) {
    if (!this.observers) this.observers = [];
    if (element.addeventlistener) {
      this.observers.push([element, name, observer, usecapture]);
      element.addeventlistener(name, observer, usecapture);
    } else if (element.attachevent) {
      this.observers.push([element, name, observer, usecapture]);
      element.attachevent('on' + name, observer);
    }
  },

  observe: function(element, name, observer, usecapture) {
    var element = $e(element);
    usecapture = usecapture || false;

    if (name == 'keypress' &&
        ((navigator.appversion.indexof('applewebkit') > 0)
        || element.attachevent))
      name = 'keydown';

    this._observeandcache(element, name, observer, usecapture);
  },

  stopobserving: function(element, name, observer, usecapture) {
    var element = $e(element);
    usecapture = usecapture || false;

    if (name == 'keypress' &&
        ((navigator.appversion.indexof('applewebkit') > 0)
        || element.detachevent))
      name = 'keydown';

    if (element.removeeventlistener) {
      element.removeeventlistener(name, observer, usecapture);
    } else if (element.detachevent) {
      element.detachevent('on' + name, observer);
    }
  }
});