//下拉菜单JS开始

var cssdropdown={

disappeardelay: 1500, //set delay in miliseconds before menu disappears onmouseout

disablemenuclick: false, //when user clicks on a menu item with a drop down menu, disable menu item's link?

enableswipe: 1, //enable swipe effect? 1 for yes, 0 for no

//No need to edit beyond here////////////////////////

dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, swipetimer: undefined, bottomclip:0,

getposOffset:function(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;

},

swipeeffect:function(){

if (this.bottomclip<parseInt(this.dropmenuobj.offsetHeight)){

this.bottomclip+=10+(this.bottomclip/10) //unclip drop down menu visibility gradually

this.dropmenuobj.style.clip="rect(0 auto "+this.bottomclip+"px 0)"

}

else

return

this.swipetimer=setTimeout("cssdropdown.swipeeffect()", 10)

},

showhide:function(obj, e){

if (this.ie || this.firefox)

this.dropmenuobj.style.left=this.dropmenuobj.style.top="-500px"

if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover"){

if (this.enableswipe==1){

if (typeof this.swipetimer!="undefined")

clearTimeout(this.swipetimer)

obj.clip="rect(0 auto 0 0)" //hide menu via clipping

this.bottomclip=0

this.swipeeffect()

}

obj.visibility="visible"

}

else if (e.type=="click")

obj.visibility="hidden"

},

iecompattest:function(){

return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body

},

clearbrowseredge:function(obj, whichedge){

var edgeoffset=0

if (whichedge=="rightedge"){

var windowedge=this.ie && !window.opera? this.iecompattest().scrollLeft+this.iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15

this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetWidth

if (windowedge-this.dropmenuobj.x < this.dropmenuobj.contentmeasure)  //move menu to the left?

edgeoffset=this.dropmenuobj.contentmeasure-obj.offsetWidth

}

else{

var topedge=this.ie && !window.opera? this.iecompattest().scrollTop : window.pageYOffset

var windowedge=this.ie && !window.opera? this.iecompattest().scrollTop+this.iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18

this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetHeight

if (windowedge-this.dropmenuobj.y < this.dropmenuobj.contentmeasure){ //move up?

edgeoffset=this.dropmenuobj.contentmeasure+obj.offsetHeight

if ((this.dropmenuobj.y-topedge)<this.dropmenuobj.contentmeasure) //up no good either?

edgeoffset=this.dropmenuobj.y+obj.offsetHeight-topedge

}

}

return edgeoffset

},

dropit:function(obj, e, dropmenuID){

if (this.dropmenuobj!=null) //hide previous menu

this.dropmenuobj.style.visibility="hidden" //hide menu

this.clearhidemenu()

if (this.ie||this.firefox){

obj.onmouseout=function(){cssdropdown.delayhidemenu()}

obj.onclick=function(){return !cssdropdown.disablemenuclick} //disable main menu item link onclick?

this.dropmenuobj=document.getElementById(dropmenuID)

this.dropmenuobj.onmouseover=function(){cssdropdown.clearhidemenu()}

this.dropmenuobj.onmouseout=function(){cssdropdown.dynamichide(e)}

this.dropmenuobj.onclick=function(){cssdropdown.delayhidemenu()}

this.showhide(this.dropmenuobj.style, e)

this.dropmenuobj.x=this.getposOffset(obj, "left")

this.dropmenuobj.y=this.getposOffset(obj, "top")

this.dropmenuobj.style.left=this.dropmenuobj.x-this.clearbrowseredge(obj, "rightedge")+"px"

this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+1+"px"

}

},

contains_firefox:function(a, b) {

while (b.parentNode)

if ((b = b.parentNode) == a)

return true;

return false;

},

dynamichide:function(e){

var evtobj=window.event? window.event : e

if (this.ie&&!this.dropmenuobj.contains(evtobj.toElement))

this.delayhidemenu()

else if (this.firefox&&e.currentTarget!= evtobj.relatedTarget&& !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget))

this.delayhidemenu()

},

delayhidemenu:function(){

this.delayhide=setTimeout("cssdropdown.dropmenuobj.style.visibility='hidden'",this.disappeardelay) //hide menu

},

clearhidemenu:function(){

if (this.delayhide!="undefined")

clearTimeout(this.delayhide)

},

startchrome:function(){

for (var ids=0; ids<arguments.length; ids++){

var menuitems=document.getElementById(arguments[ids]).getElementsByTagName("a")

for (var i=0; i<menuitems.length; i++){

if (menuitems[i].getAttribute("rel")){

var relvalue=menuitems[i].getAttribute("rel")

menuitems[i].onmouseover=function(e){

var event=typeof e!="undefined"? e : window.event

cssdropdown.dropit(this,event,this.getAttribute("rel"))

}

}

}

}

}

}

//下拉菜单JS结束