function $(ObjId){
    ///<summary>得到Obj</summary>
    return document.getElementById(ObjId);
}

function GetObj(ObjOrId){
    ///<summary>得到Obj</summary>
     var obj; 
    if(typeof(ObjOrId) == "string")
        obj = document.getElementById(ObjOrId);
    else obj = ObjOrId;
    return obj; 
}

function GetBrowser(){
    ///<summary>得到浏览器版本</summary>
    ///示例: if(Sys.ie)或 if(Sys.firefox), if(Sys.ie == '8.0')或if(Sys.firefox == '3.0') 
    ///<returns>版本信息</returns>
    var Sys = {};
    var ua = navigator.userAgent.toLowerCase();
    var s;
    (s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] :
    (s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] :
    (s = ua.match(/chrome\/([\d.]+)/)) ? Sys.chrome = s[1] :
    (s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] :
    (s = ua.match(/version\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0;
//    if (Sys.ie) document.write('IE: ' + Sys.ie);
//    if (Sys.firefox) document.write('Firefox: ' + Sys.firefox);
//    if (Sys.chrome) document.write('Chrome: ' + Sys.chrome);
//    if (Sys.opera) document.write('Opera: ' + Sys.opera);
//    if (Sys.safari) document.write('Safari: ' + Sys.safari);    
    return Sys;
}

function IsIEv(v){
    ///<summary>判断是否为IE(几)</summary>
    ///示例: IsIEv()或IsIEv(7)或IsIEv(7.0)
    ///<returns>IE判断结果</returns>
    var sys = GetBrowser();
    if(v==undefined) return sys.ie?true:false;
    return sys.ie==v?true:false; 
}

function ShowObj(ObjOrId,bShow){
    ///<summary>显示或隐藏Obj</summary>
    ///<param name="ObjOrId">要显示Obj或它的Id</param>
    ///<param name="bShow">是否显示</param>
    ///<returns>没有返回值</returns>
    var obj = GetObj(ObjOrId);
    if(obj==null) return;     
    if(bShow) obj.style.display = "";
    else obj.style.display = "none";
}

function ChangeBg(ObjOrId,BgValue){
    ///<summary>改变背景</summary>
    var obj = GetObj(ObjOrId);
    if(obj==null) return;    
    obj.style.background = BgValue;
}

 function GetQueryString(key){    
    ///<summary>取地址栏参数</summary>
    ///<param name="key">参数名</param>
     var aryUrl = new Array();
     var ary = document.location.search.substr(1).split('&');  
     //search只是根地址的查询字符串,且不包括#,如1.htm#2.htm?a=1&b=2时,为空. href则是全部地址
     for (i=0; i < ary.length;i++){     
         var hs = ary[i].split('=');     
         aryUrl[hs[0]] = hs[1];
     }    
     return aryUrl[key];
}

 function GetStringValue(str,key){   
    ///<summary>取参数值</summary>
    ///<param name="str">如a=1&b=2</param>
    ///<param name="key">参数名,如a</param> 
     var aryUrl = new Array();
     var index = str.indexOf("?");
     var ary = str.substr(index+1).split('&');  
     for (i=0; i < ary.length;i++){     
         var hs = ary[i].split('=');     
         aryUrl[hs[0]] = hs[1];
     }    
     return aryUrl[key];
}


function FindParent(Obj,Level){
    ///<summary>查找第N层的父元素</summary>
    ///<param name="Obj">元素</param>
    ///<param name="Level">层数</param> 
    var parent=Obj;
    for(var i=0;i<Level;i++)
    {
        if(parent.parentNode!=null) parent = parent.parentNode;
    } 
    return parent; 
}

function SetFrameHeight(iFrameId) {
    ///<summary>iframe高度自适应
    /// 调用方法: <iframe id="iMain" ... onload='SetFrameHeight("iMain");'></iframe>
    /// </summary> 
    ///<param name="iFrameId">iframeid</param>
    var iFra = document.getElementById(iFrameId);
    if (iFra) { //ff
        if (iFra.contentDocument && iFra.contentDocument.body.offsetHeight) {
            iFra.height = iFra.contentDocument.body.offsetHeight;
        } //ie
        else if (iFra.Document && iFra.Document.body.scrollHeight) {
            iFra.height = iFra.Document.body.scrollHeight;
        } else if (iFra.contentWindow && iFra.contentWindow.document.body.scrollHeight) {
            iFra.height = iFra.contentWindow.document.body.scrollHeight;
        }else if (iFra.contentWindow && iFra.contentWindow.document.documentElement.scrollHeight) {
            iFra.height = iFra.contentWindow.document.documentElement.scrollHeight;
        }
    }
}