Tabs = new function(){
	
	this._tabs = new Array();

	this.addTab = function(tab,link){
		this._tabs.push({tab:tab,link:link});
	}
	this.setTab = function(id){
		
		// turn off all zones
		for(t in this._tabs){
			this._tabs[t].tab.style.display = "none";
			this._tabs[t].link.className = "";
			
		}
		
		// highlight selected zone;	
		for(t in this._tabs){
			
			if(this._tabs[t].tab.id == id){
				this._tabs[t].tab.style.display = "block";
				this._tabs[t].link.className = "current";
				
			} 
		}
	}
	
	this.setSubTab = function(id,dis){
		
		document.getElementById(id).style.display = dis;
		
	}
	
}