function getTop()  
			{  
			    return self.pageYOffset || (document.documentElement && document.documentElement.scrollTop) || (document.body &&document.body.scrollTop);  
			}  
		function getHeight()  
			{  
			    return document.compatMode=='CSS1Compat' && !window.opera?document.documentElement.clientHeight:document.body.clientHeight;  
			} 
		function light(id)
			{
				document.getElementById('l1').className = 'normal';
				document.getElementById('l2').className = 'normal';
				document.getElementById('l3').className = 'normal';
				document.getElementById('l4').className = 'normal';
				document.getElementById(id).className = 'active'; 			
			}	
		function light2()  
			{  
			    var top = getTop();
				if (top < 637) light('l1');
				if (top > 636 && top < 1377) light('l2');
				if (top > 1378 && top < 2118) light('l3');
				if (top > 2117) light('l4');
			}  	
		function scrollDown(i, dest, speed)
			{
				i = i + speed;
				if (i > dest) i = dest;
				self.scroll(1, i);
				if (i < dest) setTimeout('scrollDown('+i+','+dest+','+speed+');', 7); 
			}
		function scrollUp(i, dest, speed)
			{
				i = i - speed;
				if (i < dest) i = dest;
				self.scroll(1, i);
				if (i > dest) setTimeout('scrollUp('+i+','+dest+','+speed+');', 3); 
			}			
		function menu(id)
			{
				var dest = 1;
				if (id == 'l1') dest = 1;
				if (id == 'l2') dest = 741;
				if (id == 'l3') dest = 1482;
				if (id == 'l4') dest = 2223;
				var now = getTop(); 
				var speed = getHeight() / 20;
				if (dest > now) scrollDown(now, dest, speed);
				else scrollUp(now, dest, speed);
			}
		var timer = setInterval('light2();', 200);