var menu1=new Array()
menu1[0]='<a href="build_com_ctrl.html">&nbsp;&nbsp;微机控制钟</a>'
menu1[1]='<a href="build_master_slave.html">&nbsp;&nbsp;子母智能钟</a>'
menu1[2]='<a href="build_GPS.html">&nbsp;&nbsp;GPS校时钟</a>'
var menu2=new Array()
menu2[0]='<a href="tower_europe.html">&nbsp;&nbsp;欧式塔钟</a>'
menu2[1]='<a href="tower_chinese.html">&nbsp;&nbsp;中式塔钟</a>'
var menu3=new Array()
menu3[0]='<a href="view_art_sculpture.html">&nbsp;&nbsp;艺术雕塑钟</a>'
menu3[1]='<a href="view_parterre.html">&nbsp;&nbsp;花坛钟</a>'
menu3[2]='<a href="view_ground.html">&nbsp;&nbsp;地钟</a>'
var menu4=new Array() 
menu4[0]='<a href="street_art.html">&nbsp;&nbsp;艺术街钟</a>'
menu4[1]='<a href="street_post.html">&nbsp;&nbsp;邮钟</a>'
menu4[2]='<a href="street_advertisement.html">&nbsp;&nbsp;广告式街钟</a>'
var menu5=new Array()
menu5[0]='<a href="digital_calendar.html">&nbsp;&nbsp;万年历钟</a>'
menu5[1]='<a href="digital_pointer.html">&nbsp;&nbsp;数字指针钟</a>'
menu5[2]='<a href="digital_mix.html">&nbsp;&nbsp;混合钟</a>'
var menu6=new Array()
menu6[0]='<a href="special_match_time.html">&nbsp;&nbsp;比赛计时钟</a>'
menu6[1]='<a href="special_operation.html">&nbsp;&nbsp;手术专用钟</a>'
menu6[2]='<a href="special_world_time.html">&nbsp;&nbsp;世界时差钟</a>'

		var menuwidth='135px' //default menu width
		var menubgcolor='#FFFFFF'  //menu bgcolor
		var disappeardelay=250  //menu disappear speed onMouseout (in miliseconds)
		var hidemenu_onclick="yes" //hide menu when user clicks within menu?

		var ie4=document.all
		var ns6=document.getElementById&&!document.all

		if (ie4||ns6)
		document.write('<div id="dropmenudiv" style="visibility:hidden;width:'+menuwidth+';background-color:'+menubgcolor+'" onMouseover="clearhidemenu()" onMouseout="dynamichide(event)"></div>')

		function getposOffset(what, offsettype){
		var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop;
		var parentEl=what.offsetParent;
		while (parentEl!=null){
		totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
		parentEl=parentEl.offsetParent;
		}
		return totaloffset;
		}


		function showhide(obj, e, visible, hidden, menuwidth){
		if (ie4||ns6)
		dropmenuobj.style.left=dropmenuobj.style.top="-500px"
		if (menuwidth!=""){
		dropmenuobj.widthobj=dropmenuobj.style
		dropmenuobj.widthobj.width=menuwidth
		}
		if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover")
		obj.visibility=visible
		else if (e.type=="click")
		obj.visibility=hidden
		}

		function iecompattest(){
		return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
		}

		function clearbrowseredge(obj, whichedge){
		var edgeoffset=0
		if (whichedge=="rightedge"){
		var windowedge=ie4 && !window.opera? iecompattest().scrollLeft+iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15
		dropmenuobj.contentmeasure=dropmenuobj.offsetWidth
		if (windowedge-dropmenuobj.x < dropmenuobj.contentmeasure)
		edgeoffset=dropmenuobj.contentmeasure-obj.offsetWidth
		}
		else{
		var topedge=ie4 && !window.opera? iecompattest().scrollTop : window.pageYOffset
		var windowedge=ie4 && !window.opera? iecompattest().scrollTop+iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18
		dropmenuobj.contentmeasure=dropmenuobj.offsetHeight
		if (windowedge-dropmenuobj.y < dropmenuobj.contentmeasure){ //move up?
		edgeoffset=dropmenuobj.contentmeasure+obj.offsetHeight
		if ((dropmenuobj.y-topedge)<dropmenuobj.contentmeasure) //up no good either?
		edgeoffset=dropmenuobj.y+obj.offsetHeight-topedge
		}
		}
		return edgeoffset
		}

		function populatemenu(what){
		if (ie4||ns6)
		dropmenuobj.innerHTML=what.join("")
		}


		function dropdownmenu(obj, e, menucontents, menuwidth){
		if (window.event) event.cancelBubble=true
		else if (e.stopPropagation) e.stopPropagation()
		clearhidemenu()
		dropmenuobj=document.getElementById? document.getElementById("dropmenudiv") : dropmenudiv
		populatemenu(menucontents)

		if (ie4||ns6){
		showhide(dropmenuobj.style, e, "visible", "hidden", menuwidth)
		dropmenuobj.x=getposOffset(obj, "left")-10
		dropmenuobj.y=getposOffset(obj, "top")
		dropmenuobj.style.left=dropmenuobj.x-clearbrowseredge(obj, "rightedge")+"px"
		dropmenuobj.style.top=dropmenuobj.y-clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+"px"
		}

		return clickreturnvalue()
		}

		function clickreturnvalue(){
		if (ie4||ns6) return false
		else return true
		}

		function contains_ns6(a, b) {
		while (b.parentNode)
		if ((b = b.parentNode) == a)
		return true;
		return false;
		}

		function dynamichide(e){
		if (ie4&&!dropmenuobj.contains(e.toElement))
		delayhidemenu()
		else if (ns6&&e.currentTarget!= e.relatedTarget&& !contains_ns6(e.currentTarget, e.relatedTarget))
		delayhidemenu()
		}

		function hidemenu(e){
		if (typeof dropmenuobj!="undefined"){
		if (ie4||ns6)
		dropmenuobj.style.visibility="hidden"
		}
		}

		function delayhidemenu(){
		if (ie4||ns6)
		delayhide=setTimeout("hidemenu()",disappeardelay)
		}

		function clearhidemenu(){
		if (typeof delayhide!="undefined")
		clearTimeout(delayhide)
		}

		if (hidemenu_onclick=="yes")
		document.onclick=hidemenu