function Dsy(){
	this.Items = {};
}

Dsy.prototype.add = function(id,iArray){
	this.Items[id] = iArray; 
}

Dsy.prototype.Exists = function(id){
	if(typeof(this.Items[id]) == "undefined"){
		return false;
	}
	return true; 
}

function change(v){
	var str="0";
	for(i=0;i<v;i++){
		str+=("_"+(document.getElementById(s[i]).selectedIndex-1));
	};
	var ss=document.getElementById(s[v]);
	with(ss){
		length = 0;
		options[0]=new Option(opt0[v],opt0[v]);
		if(v && document.getElementById(s[v-1]).selectedIndex>0 || !v){
			if(dsy.Exists(str)){
				ar = dsy.Items[str];
				for(i=0;i<ar.length;i++)options[length]=new Option(ar[i],ar[i]);
				if(v)options[1].selected = true;
			}
		}
		if(++v<s.length){
			change(v);
		}
	}
}