var menuOffX=0    //菜单距连接文字最左端距离
var menuOffY=20    //菜单距连接文字顶端距离

var nowhide
var ie4=document.all&&navigator.userAgent.indexOf("Opera")==-1
var ns6=document.getElementById&&!document.all
function showmenu(e,vmenu,mod){
    which=vmenu
        nowhide=false
    menuobj=document.getElementById("popmenu")
    menuobj.thestyle=menuobj.style
    menuobj.innerHTML=which
    menuobj.contentwidth=menuobj.offsetWidth
    eventX=e.clientX
    eventY=e.clientY
    var rightedge=document.body.clientWidth-eventX
    var bottomedge=document.body.clientHeight-eventY

        if (rightedge<menuobj.contentwidth)
            menuobj.thestyle.left=document.body.scrollLeft+eventX-menuobj.contentwidth+menuOffX
        else
            menuobj.thestyle.left=ie4? ie_x(event.srcElement)+menuOffX : ns6? window.pageXOffset+eventX : eventX
        
        if (bottomedge<menuobj.contentheight&&mod!=0)
            menuobj.thestyle.top=document.body.scrollTop+eventY-menuobj.contentheight-event.offsetY+menuOffY-23
        else
            menuobj.thestyle.top=ie4? ie_y(event.srcElement)+menuOffY : ns6? window.pageYOffset+eventY+10 : eventY

    menuobj.thestyle.visibility="visible"
}


function ie_y(e){  
    var t=e.offsetTop;  
    while(e=e.offsetParent){  
        t+=e.offsetTop;  
    }  
    return t;  
}  
function ie_x(e){  
    var l=e.offsetLeft;  
    while(e=e.offsetParent){  
        l+=e.offsetLeft;  
    }  
    return l;  
}

function highlightmenu(e,state){
    if (document.all)
        source_el=event.srcElement
        while(source_el.id!="popmenu"){
            source_el=document.getElementById? source_el.parentNode : source_el.parentElement
            if (source_el.className=="menuitems"){
                source_el.id=(state=="on")? "mouseoverstyle" : ""  //鼠标停留时样式
        }
    }
}


function hidemenu(){
if (window.menuobj&&nowhide)menuobj.thestyle.visibility="hidden"
}
function dynamichide(e){if ((ie4||ns6)&&!menuobj.contains(e.toElement))hidemenu()}
document.onclick=hidemenu
document.write("<div class='menuskin' id='popmenu' onmouseover=\"")
document.write("nowhide=false;highlightmenu(event,'on')\" ")
document.write("onmouseout=\"nowhide=true;highlightmenu(event,'off');dynamichide(event)\"></div>")