function launchTimeline()
{
	var timelineURL = "http://www.bl.uk/learning/timeline/index.html";
	
	var agt=navigator.userAgent.toLowerCase();
	this.mac = (agt.indexOf("mac")!=-1);
	this.ie  = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
	this.chrome = (agt.indexOf("chrome")!=-1);
	
	var arm_macie = false;
	var arm_offsety = 0;
	var arm_offsetx = 0;
	var xMax=1024;
	var yMax=768;
	
	if((this.mac)&&(this.ie))
	{
		 arm_macie = true;
		 arm_offsety = 100;
		 arm_offsetx = 5;
	}
	
	if (document.all)
	{
		if(arm_macie)
		{
			xMax = screen.width;
			yMax = screen.height;
		}
		else
		{
			xMax = screen.width-8;
			yMax = screen.height-35;
		}
	}
	else
	{
		if (document.layers)
		{
			xMax = window.outerWidth;
			yMax = window.outerHeight;
		}
		else
		{
			xMax = screen.width;
			yMax = screen.height;
		}
	}
	window.open(timelineURL,'index','status=no,toolbar=no,directories=no,menubar=no,location=no,resizable=no,scrollbars=no,history=no,width='+xMax+',height='+yMax+',screenX=0,screenY=0,top=0,left=0');

}