var Chronology = 
{
	menu : new Array(),
	data : new Array(),
	
	init : function()
	{
		var oMenu = document.getElementById("chrono_biannual");
		if(oMenu == undefined) return;
		for(var i=0; (a = oMenu.getElementsByTagName("A")[i]); i++)
		{
			a.setAttribute('href', 'javascript:Chronology.change('+i+')');
			Chronology.menu.push(a);
		}
		
		var oColRight = document.getElementById("chrono_colRight");
		for(var i=0; (d = oColRight.getElementsByTagName("DIV")[i]); i++)
		{
			if(d.className == "chrono_data") Chronology.data.push(d);
		}
	},
	
	change : function(n)
	{
		for(var i=0; i<this.data.length; i++)
		{
			if(this.menu[i].id == "biannual_1") this.menu[i].removeAttribute("id");
			this.menu[i].className = "";
			this.data[i].style.display = "none";
		}
		this.menu[n].className = "selected";
		this.data[n].style.display = "block";
	}
}

//---------------------------------------------

EventManager.addEvent(window, "load", Chronology.init);