// JScript 文件

function getEvent()
{
    if(document.all)
    {
        return window.event;//如果是ie
    }
    func=getEvent.caller;
    while(func!=null)
    {
        var arg0=func.arguments[0];
        if(arg0)
        {
            if((arg0.constructor==Event || arg0.constructor ==MouseEvent)
            ||(typeof(arg0)=="object" && arg0.preventDefault && arg0.stopPropagation))
            {
            return arg0;
            }
        }
        func=func.caller;
    }
    return null;
}
//参数介绍：
//where：插入位置。包括beforeBegin,beforeEnd,afterBegin,afterEnd。
//el：用于参照插入位置的html元素对象
//html：要插入的html代码
function insertHtml(where, el, html){
        where = where.toLowerCase();
        if(el.insertAdjacentHTML){
            switch(where){
                case "beforebegin":
                    el.insertAdjacentHTML('BeforeBegin', html);
                    return el.previousSibling;
                case "afterbegin":
                    el.insertAdjacentHTML('AfterBegin', html);
                    return el.firstChild;
                case "beforeend":
                    el.insertAdjacentHTML('BeforeEnd', html);
                    return el.lastChild;
                case "afterend":
                    el.insertAdjacentHTML('AfterEnd', html);
                    return el.nextSibling;
            }
            throw 'Illegal insertion point -> "' + where + '"';
        }
  var range = el.ownerDocument.createRange();
        var frag;
        switch(where){
             case "beforebegin":
                range.setStartBefore(el);
                frag = range.createContextualFragment(html);
                el.parentNode.insertBefore(frag, el);
                return el.previousSibling;
             case "afterbegin":
                if(el.firstChild){
                    range.setStartBefore(el.firstChild);
                    frag = range.createContextualFragment(html);
                    el.insertBefore(frag, el.firstChild);
                    return el.firstChild;
                }else{
                    el.innerHTML = html;
                    return el.firstChild;
                }
            case "beforeend":
                if(el.lastChild){
                    range.setStartAfter(el.lastChild);
                    frag = range.createContextualFragment(html);
                    el.appendChild(frag);
                    return el.lastChild;
                }else{
                    el.innerHTML = html;
                    return el.lastChild;
                }
            case "afterend":
                range.setStartAfter(el);
                frag = range.createContextualFragment(html);
                el.parentNode.insertBefore(frag, el.nextSibling);
                return el.nextSibling;
            }
            throw 'Illegal insertion point -> "' + where + '"';
    }
 function IeTrueBody()
{
    return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body;
}