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function Hashtable()

{

this._hash = new Object();

this.add = function(key,value){

if(typeof(key)!="undefined"){

if(this.contains(key)==false){

this._hash[key]=typeof(value)=="undefined"?null:value;

return true;

} else {

return false;

}

} else {

return false;

}

this.remove = function(key){delete this._hash[key];}

this.count = function(){var i=0;for(var k in this._hash){i++;} return i;}

this.items = function(key){return this._hash[key];}

this.contains = function(key){ return typeof(this._hash[key])!="undefined";}

this.clear = function(){for(var k in this._hash){delete this._hash[k];}}

}

var a = new Hashtable();

a.add("aa");

a.add("bb",2342);

a.remove("aa");

alert(a.count());

alert(a.contains("bb"));

alert(a.contains("aa"));

alert(a.items("bb"));

</script>

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