var yOffset=160;
var yPosition=160;
var yTempPosition;
var speed=0.06;
var stop=0;
var menu;
function stop(){
clearInterval();
}



function init(){
	menu.style.pixelTop=yPosition;	
	setInterval('moveMenu()',20);
}
function moveMenu(){

	yPosition=menu.style.pixelTop;
	yTempPosition=document.body.scrollTop+yOffset;

		if(yTempPosition<yPosition){
		
			yPosition=yPosition+speed*(yTempPosition-yPosition);	
		stop=0;
		}	
		if(yTempPosition>yPosition){
		
			yPosition=yPosition-speed*(yPosition-yTempPosition-50);
		stop=0;	
		}
	menu.style.pixelTop=yPosition;
	if(Math.abs(yTempPosition-yPosition)<1)
			stop=1;	

}