function MenuShow(id)
{
    var obj=document.getElementById(id);
    obj.style.display="inline";
}
function MenuHide(id)
{
    var obj=document.getElementById(id);
    obj.style.display="none";
}
function SetHeight(obj1,obj2)
{
    function GetObj(id) 
    {
        if (document.getElementById) 
        {
             return document.getElementById(id);
        }   
        else if (document.all) 
        {
            return document.all[id];
        }
        else if (document.layers) 
        {
            return document.layers[id];
        } 
        else 
        {
            return null;
        }
    }
    var Box1 = GetObj(obj1);
    var Box2 = GetObj(obj2);
    var maxHeight = 0;
    maxHeight = Box2.scrollHeight;
    maxHeight = maxHeight > Box1.scrollHeight ? maxHeight:Box1.scrollHeight;//比较选出最大高度
    Box1.style.height = Box2.style.height = maxHeight;//设置为最大高度
} 
function ChangeSel(id,Pid)
{
    var obj=document.getElementById(id);
    if(obj.className=="nav_sel")
    {
        return;
    }
    else if(obj.className=="nav_none")
    {
        var table=document.getElementById(Pid);
        var row=table.rows;
        for(var i=0;i<row.length;i++)
        {
            if(row[i].className=="nav_sel")
            {
                row[i].className="nav_none";
                var sub=document.getElementById(row[i].id+"_sub");

                if(sub!=null)
                {
                    sub.style.display="none";
                }
                break;
            }
        }
        obj.className="nav_sel";
        var sub=document.getElementById(obj.id+"_sub");
        if(sub!=null)
        {
            sub.style.display="inline";
        }
    }
}
function ChangeTab(id,Pid)
{
    var obj=document.getElementById(id);
    var ul=document.getElementById(Pid);
    var n=ul.childNodes.length;
    for(var i=0;i<n;i++)
    {
        ul.childNodes[i].className="tab_none";
        var sub=document.getElementById(ul.childNodes[i].id+"_div");
        if(sub!=null)
        {
            sub.style.display="none";
        }
    }
    obj.className="tab_sel";
    var sub=document.getElementById(obj.id+"_div");
    if(sub!=null)
    {
        sub.style.display="inline";
    }
    SetHeight("left","center");
}
function ChangeTabStyle(obj,b)
{
    var tab_div=document.getElementById(obj.id+"_div");
    if(b)
    {
        if(tab_div.style.display=="none")
        {
            obj.className="tab_hover";
        }
    }
    else
    {
        if(tab_div.style.display=="none")
        {
            obj.className="tab_none";
        }
    }
}