var menu=function(){
	var t=1,z=2000,s=1,a; // s= 1/(frame increment). small s = faster animation
	function dd(n){this.n=n; this.h=[]; this.c=[]}
	
	dd.prototype.init=function(p,c){

		a=c; var w=document.getElementById(p), s=w.getElementsByTagName('ul'), l=s.length, i=0;
		for(i;i<l;i++){
			// h=current parent node
			// this.h[]=array of parent nodes
			// this.c[]=array of child nodes
			// n = id of top-level ul - "menu" in this case
			var h=s[i].parentNode; this.h[i]=h; this.c[i]=s[i];
			// bind "over" and "out" events to parent node
			// e.g. h.mouseouver = function menu.st(2,true) - t/f is over or out
			h.onmouseover=new Function(this.n+'.st('+i+',true)');
			h.onmouseout=new Function(this.n+'.st('+i+')');
		}
	}
	// defines the st() function for all instaces of dd -- e.g., "menu"
	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';
		var zwy = p.className.indexOf('ms2');
		if(f){ // if mouseover
			var zwx = p.className.indexOf('ms');
			if(zwx<0){
				p.className+=' '+a;		
			}else {
				if(zwy<0){
					p.className+=' '+ 'msh'; //large-size toptab
				}else{
					p.className+=' '+ 'msh2';
				}
			}
			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,'');
			if(zwy<0){
				p.className=p.className.replace('msh',''); // large-size toptab mouseout
			}else{
				p.className=p.className.replace('msh2','');
			}
			c.t=setInterval(function(){sl(c,-1)},t);
		}
	}
	function sl(c,f){
		var h=c.offsetHeight;
		
		/* uncomment to make menus instant instead of fading.
		if(f==1){c.style.filter=''; c.style.opacity=1; c.style.overflow='visible'};
		if(f!=1){c.style.filter=''; c.style.opacity=0; c.style.overflow='hidden'};
		return;
		*/
		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};
}();