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菜单特效

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.51wendang.com/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.5


1wendang.com/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>下拉效果</title>
<script type=text/javascript>
function $(d){
return document.getElementById(d);
}
// set or get the current display style of the div
function dsp(d,v){
if(v==undefined){
return d.style.display;
}else{
d.style.display=v;
}
}
// set or get the height of a div.
function sh(d,v){
// if you are getting the height then display must be block to return the absolute height
if(v==undefined){
if(dsp(d)!='none'&& dsp(d)!=''){
return d.offsetHeight;
}
viz = d.style.visibility;
d.style.visibility = 'hidden';
o = dsp(d);
dsp(d,'block');
r = parseInt(d.offsetHeight);
dsp(d,o);
d.style.visibility = viz;
return r;
}else{
d.style.height=v;
}
}
/*
* Variable 'S' defines the speed of the accordian
* Variable 'T' defines the refresh rate of the accordian
*/
s=7;
t=10;
//Collapse Timer is triggered as a setInterval to reduce the height of the div exponentially.
function ct(d){
d = $(d);
if(sh(d)>0){
v = Math.round(sh(d)/d.s);
v = (v<1) ? 1 :v ;
v = (sh(d)-v);
sh(d,v+'px');
d.style.opacity = (v/d.maxh);
d.style.filter= 'alpha(opacity='+(v*100/d.maxh)+');';
}else{
sh(d,0);
dsp(d,'none');
clearInterval(d.t);
}
}
//Expand Timer is triggered as a setInterval to increase the height of the div exponentially.
function et(d){
d = $(d);
if(sh(d)<d.maxh){
v = Math.round((d.maxh-sh(d))/d.s);
v = (v<1) ? 1 :v ;
v = (sh(d)+v);
sh(d,v+'px');
d.style.opacity = (v/d.maxh);
d.style.filter= 'alpha(opacity='+(v*100/d.maxh)+');';
}else{
sh(d,d.maxh);
clearInterval(d.t);
}
}
// Collapse Initializer
function cl(d){
if(dsp(d)=='block'){
clearInterval(d.t);
d.t=setInterval('ct("'+d.id+'")',t);
}
}
//Expand Initializer
function ex(d){
if(dsp(d)=='none'){
dsp(d,'block');
d.style.height='0px';
clearInterval(d.t);
d.t=setInterval('et("'+d.id+'")',t);
}
}
// Removes Classname from the given div.
function cc(n,v){
s=n.className.split(/\s+/);
for(p=0;p<s.length;p++){
if(s[p]==v+n.tc){
s.splice(p,1);
n.className=s.join(' ');
break;
}
}
}
//Accordian Initializer
function Accordian(d,s,tc){
// get all the elements that have id as content
l=$(d).getElementsByTagName('div');
c=[];
for(i=0;i<l.length;i++){
h=l[i].id;
if(h.substr(h.indexOf('-')+1,h.length)=='content'){c.push(h);}
}
sel=null;
//then search through headers
for(i=0;i<l.length;i++){
h=l[i].id;
if(h.substr(h.indexOf('-')+1,h.length)=='header'){
d=$(h.substr(0,h

.indexOf('-'))+'-content');
d.style.display='none';
d.style.overflow='hidden';
d.maxh =sh(d);
d.s=(s==undefined)? 7 : s;
h=$(h);
h.tc=tc;

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