dropdown

var menu=function(){
var t=15,z=50,s=6,a;
function dd(n){this.n=n; this.h=[]; this.c=[]}
dd.prototype.init=function(p,c){
a=c; //Old code: var w=document.getElementById(p), s=w.getElementsByTagName('ul'), l=s.length, i=0;

var w=p, s=w.getElementsByTagName('ul'), l=s.length, i=0;
for(i;i<l;i++){
var h=s[i].parentNode; this.h[i]=h; this.c[i]=s[i];
h.onmouseover=new Function(this.n+'.st('+i+',true)');
h.onmouseout=new Function(this.n+'.st('+i+')');
}
}
dd.prototype.st=function(x,f){
var c=this.c[x], h=this.h[x], p=h.getElementsByTagName('a')[0];
clearInterval(c.t); c.style.overflow='hidden';
if(f){
p.className+=' '+a;
if(!c.mh){c.style.display='block'; c.style.height=''; c.mh=c.offsetHeight; c.style.height=0}
if(c.mh==c.offsetHeight){c.style.overflow='visible'}
else{c.style.zIndex=z; z++; c.t=setInterval(function(){sl(c,1)},t)}
}else{p.className=p.className.replace(a,''); c.t=setInterval(function(){sl(c,-1)},t)}
}
function sl(c,f){
var h=c.offsetHeight;
if((h<=0&&f!=1)||(h>=c.mh&&f==1)){
if(f==1){c.style.filter=''; c.style.opacity=1; c.style.overflow='visible'}
clearInterval(c.t); return
}
var d=(f==1)?Math.ceil((c.mh-h)/s):Math.ceil(h/s), o=h/c.mh;
c.style.opacity=o; c.style.filter='alpha(opacity='+(o*100)+')';
c.style.height=h+(d*f)+'px'
}
return{dd:dd}
}();

document.getElementsByClassName = function (c, t) {
  t = this.getElementsByTagName(t ? t : "*");
  for (var i = 0, r = new Array(), l = t.length; i < l; i++)
    if (t[i].className == c)
      r[r.length] = t[i];
  return r;
}

var _Menus = new Array();
function initializeDateDropDowns(){
var box = document.getElementsByClassName('menu','ul');
if (box.length > 0) {
for(i = 0; i < box.length; i++) {
var id = box[i];
_Menus[i] = new menu.dd('_Menus[' + i + ']');
_Menus[i].init(id,"menuhover");
}
}
}
window.onload = initializeDateDropDowns;