dedecms怎么做下拉菜单

<!-- //二级子类下拉菜单，考虑SEO原因放置于底部 -->     <script></script>     {dede:channelartlist typeid='top' cacheid='channelsonlist'}     

var cssdropdown={ disappeardelay: 250,  disablemenuclick: false,  enableswipe: 1,  enableiframeshim: 1,  dropmenuobj: null, ie: document.all, firefox: document.getElementById&amp;&amp;!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.bottomclip this.dropmenuobj.style.clip="rect(0 auto " else return this.swipetimer='setTimeout("cssdropdown.swipeeffect()", 10)' showhide:function if this.dropmenuobj.style.left='this.dropmenuobj.style.top="-500px"' cleartimeout obj.clip="rect(0 auto 0 0)" this.swipeeffect obj.visibility="visible" iecompattest:function clearbrowseredge:function var this.dropmenuobj.contentmeasure="this.dropmenuobj.offsetWidth" edgeoffset="this.dropmenuobj.contentmeasure-obj.offsetWidth" dropit:function this.dropmenuobj.style.visibility="hidden" this.clearhidemenu obj. this.dropmenuobj="document.getElementById(dropmenuID)" this.dropmenuobj. this.showhide this.dropmenuobj.x='this.getposOffset(obj, "left")' this.dropmenuobj.y='this.getposOffset(obj, "top")' this.dropmenuobj.style.top='this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+1+"px"' this.positionshim positionshim:function this.shimobject.style.width='this.dropmenuobj.offsetWidth+"px"' this.shimobject.style.height='this.dropmenuobj.offsetHeight+"px"' this.shimobject.style.left="this.dropmenuobj.style.left" this.shimobject.style.top="this.dropmenuobj.style.top" this.shimobject.style.display='(this.dropmenuobj.style.visibility=="visible")? "block" : "none"' hideshim:function contains_firefox:function while dynamichide:function this.delayhidemenu delayhidemenu:function this.delayhide="setTimeout(&quot;cssdropdown.dropmenuobj.style.visibility='hidden'; cssdropdown.hideshim()&quot;,this.disappeardelay) " clearhidemenu:function startchrome:function for menuitems cssdropdown.dropit document.write>') this.shimobject=document.getElementById("iframeshim")  } } }</parseint>

getposOffset:function(what, offsettype) swipeeffect:function() showhide:function(obj, e)  iecompattest:function() clearbrowseredge:function(obj, whichedge) dropit:function(obj, e, dropmenuID) positionshim:function() hideshim:function() dynamichide:function(e) delayhidemenu:function() clearhidemenu:function() startchrome:function()