var navArrowSlider = function(navWrap, navElementsArray, activeID, arrowY) {
	var youAreHere = new Fx.Tween($(navWrap), { 
		duration: 500,
		transition: Fx.Transitions.Elastic.easeOut  
	});

	$$(navElementsArray).each(function(item){  
		item.addEvent('mouseenter', function() { 
			var thisPos = item.getPosition(navWrap).x  + item.getSize().x - 50; 
			youAreHere.cancel();
			youAreHere.start('background-position', thisPos + 'px ' + arrowY + 'px'); 
		});
	});
	
	var currentArrow = function() {
		youAreHere.cancel();
		var activePos = $(activeID).getPosition(navWrap).x  + $(activeID).getSize().x - 50; 
		youAreHere.start('background-position', activePos + 'px ' + arrowY + 'px');      
	};
	 
	//correct IE rendering problem (without this, it wont go to the active nav onload)
	var activePos = $(activeID).getPosition(navWrap).x  + $(activeID).getSize().x - 50;  
	$(navWrap).setStyle('background-position', activePos + 'px ' + arrowY + 'px');       
	
	//works to set image to starting position in other browsers
	currentArrow(); 
	
	$(navWrap).addEvent('mouseleave', currentArrow);	
};