var t = 0;
var play = 1;
	
	function nav_stop_topnav()
	{
		play = 0;
	}
	
	function nav_links_topnav()
	{

		if(play == 1)
		{
			t += 3;
			/*alert(document.getElementById("contents_topnav").style.left);*/

			with(document.getElementById("contents_topnav"))
			{								
					if(style)
						style.left = t + "px";
					else
						setAttribute("style", "left: " + t + "px");
			}
			
			setTimeout("nav_links_topnav()",10);

			return t;
			
		}
		else
		{
			play = 1;
		}
	}
	
	function nav_rechts_topnav()
	{
		if(play == 1)
		{
			t -= 3;
			with(document.getElementById("contents_topnav"))
			{								
					if(style)
						style.left = t + "px";
					else
						setAttribute("style", "left: " + t + "px");
			}
			setTimeout("nav_rechts_topnav()",10)
			return t;
		}
		else
		{
			play = 1;
		}
	}