lastScrollX = 0; lastScrollY = 0;
NS = (document.layers) ? 1 : 0;
IE = (document.all) ? 1: 0;
var offset=20; 

function ruch(){				
		if(IE){					 	
			if(offset > document.all.topnav.style.pixelTop) document.all.topnav.style.pixelTop +=10;
		}
		if(NS){
			if(offset > document.topnav.top) document.topnav.top +=5;				
		}
		setTimeout("ruch()",0);
}

function turn_on() {		
            if(IE) { diffY = document.body.scrollTop;}
            if(NS) { diffY = self.pageYOffset;}
                
                if(diffY != lastScrollY) {
                        percent = .1 * (diffY - lastScrollY);
                        if(percent > 0) percent = Math.ceil(percent);
                        else percent = Math.floor(percent);
                                        if(IE) document.all.topnav.style.pixelTop += percent;
                                        if(NS) document.topnav.top += percent; 
                        lastScrollY = lastScrollY + percent;
            	}
				
}
		
if(IE) document.all.topnav.style.visibility = "visible";
if(NS) document.topnav.visibility = "show";

ruch();

if(NS || IE) window.setInterval("turn_on()",1);