function mzone(){};

/**

 * Desc   : 使用给定的对象路径进行对象的创建

 * Para   : objPath - 对象路径，字符串类型，格式为：xx.yy.zz

 * Return : 没有返回值,创建成功后直接使用对象路径即可

 */

mzone.createObject = function(/*string*/objPath) {

 if (!objPath || typeof(objPath) != 'string') return;

 var root = window;

 var parts = objPath.split('.');

 for (var i = 0; i < parts.length; i ++) {

  if (typeof(root[parts[i]]) == 'undefined') root[parts[i]] = {};

  root = root[parts[i]];

 }

};

mzone.createObject("mzone.cc.iframe");

/**

 * Desc   : 定义对象mzone.cc.iframe的静态方法实现iframe动态调整

 * Para   : iframe - 要调整的iframe对象，DOM对象

 *          extHeight - 自动计算iframe的高度后额外增加的高度值，数字型

 *          minHeight - iframe的最小高度，数字型

 * Return : 没有返回值

 */

mzone.cc.iframe.autoHeight = function(/*object*/iframe, /*int*/extHeight, /*int*/minHeight) {

 iframe.style.display = "block";

 if (iframe.contentDocument && iframe.contentDocument.body.offsetHeight) { // ff,chrome等

  var h = parseInt(iframe.contentDocument.body.offsetHeight) + 50;

  h += extHeight;

  if (h < minHeight) h = minHeight;

  iframe.height = h + "px";

 } else if (iframe.Document && iframe.Document.body.scrollHeight) { // IE

  var h = parseInt(iframe.Document.body.scrollHeight) + 35;

  h += extHeight;

  if (h < minHeight) h = minHeight;

  iframe.height = h + "px";

 } else {

  var h = parseInt(iframe.contentWindow.document.documentElement.scrollHeight) + 35;

  h += extHeight;

  if (h < minHeight) h = minHeight;

  iframe.height = h + "px";

 }

}

      var iframe = document.getElementById("iframe_body"); // iframe对象

var extHeight = 0; // 要额外增加的iframe的高度值

var minHeight = 300; // iframe的最小高度设置

mzone.cc.iframe.autoHeight(iframe, extHeight, minHeight);