var ContentSwitcher = function()
{
	var ref = this;

	this._content = new Array();

	this.addContent = function(content)
	{
		this._content.push(content);
	}

	this.updateContent = function()
	{
		for(area in this._content)
		{
			var curr_area = this._content[area];
			curr_area.dom = new Array();
			for(index in curr_area.ids)
			{
				curr_area.dom[index] = document.getElementById(curr_area.ids[index]);
				var dom = curr_area.dom[index];
				changeOpac(0, dom);
				dom.style.zIndex = 0;
				dom.style.display = 'block';
				dom.style.position = 'absolute';
				dom.style.top = 0;
				dom.style.left = 0;
			}
		}
		this.fade(0);
		return false;
	}

	this.fade = function(opacity)
	{
		if(opacity < 100)
		{
			for(area in this._content)
			{
				var curr_area = this._content[area];
				changeOpac(opacity, curr_area.dom[curr_area.current]);
			}
			setTimeout(function(){ref.fade(opacity+10);}, 30);
		}
		else
		{
			for(area in this._content)
			{
				var curr_area = this._content[area];
				if(curr_area.dom[curr_area.current - 1])
				{
					changeOpac(0, curr_area.dom[curr_area.current - 1]);
				}
				else
				{
					changeOpac(0, curr_area.dom[curr_area.dom.length - 1]);
				}
				if(curr_area.dom[curr_area.current])
				{
					curr_area.dom[curr_area.current].style.zIndex = 0;
				}
				if(curr_area.dom[curr_area.current + 1])
				{
					curr_area.current++;
				}
				else
				{
					curr_area.current = 0;
				}
				if(curr_area.dom[curr_area.current])
				{
					curr_area.dom[curr_area.current].style.zIndex = 100;
				}
			}
			setTimeout(function(){ref.fade(0);},5000);
		}
	}
}

function changeOpac(opacity, dom)
{
	if(!dom || !dom.style)
	{
		return;
	}
	if(dom.style.MozOpacity != null)
	{
		dom.style.MozOpacity = (opacity / 100);
	}
	else if(dom.style.opacity != null)
	{
		dom.style.opacity = (opacity / 100);
	}
	else if(dom.style.filter != null)
	{
		dom.style.filter = 'alpha(opacity='+opacity+')';
	}
}