var t = 0;
var play = 1;
//var t = document.getElementById("contents_topnav").style.left;
	
function nav_stop_topnav()
{
	play = 0;
}

function nav_links_topnav()
{
	if(play == 1)
	{
		if(t <0)
		{
			t += 2;
		}
		
		with(document.getElementById("contents_topnav"))
		{								
			if(style)
				document.getElementById("contents_topnav").style.left = t + "px";
			else
				setAttribute("style", "left: " + t + "px");
		}
		
		setTimeout("nav_links_topnav()",10);
		return t;
	}
	else
	{
		play = 1;
	}
}

function nav_rechts_topnav(aantal_fotos)
{
	if(play == 1)
	{
			waarde = aantal_fotos * 190;
			waarde = 0 - waarde + 250;
			
			if(t > waarde)
			{
				t -= 2;	
			}
			
			with(document.getElementById("contents_topnav"))
			{								
					if(style)
						style.left = t + "px";
					else
						setAttribute("style", "left: " + t + "px");
			}
			setTimeout("nav_rechts_topnav("+ aantal_fotos + ")",10);
			return t;
	}
	else
	{
		play = 1;
	}
}