var slideY0 = 0;
	var lastY = 0;
	var pos = 0;
	var tout = null;
	var slideLay = null;
	var slidingEnded = true;
	
	function getLayTop() {
		return layerTop(slideLay);
	}
	function setLayTop(y) {
		layerTop(slideLay, y);
	}
	function checkScrolling() {
		y = documentTop(document);
			if (lastY != y)
				slideTo(y + slideY0);
			lastY = y;
		setTimeout( "checkScrolling()", 25);
	}
	function slideTo(endpos) {
		if (slideLay != null) {
			if (tout)
				clearTimeout(tout);
			else
				pos = layerTop(slideLay);     
			slide(endpos);
		}
	}
	function slide(endpos) {
		if (pos != endpos) {
			pos = pos + Math.floor((endpos - pos)/8);
			layerTop(slideLay, pos);
			cmd = "slide(" + endpos + ")";
			if (document.all)
				clearTimeout(tout);
			tout = setTimeout(cmd, 50);
		}
	}
	function init() {
		slideLay = getLayer("navigation");
		if (slideLay != null) {
			slideY0 = layerTop(slideLay);
			showLayer(slideLay);
			checkScrolling();
		}
	}
function documentTop(doc) {
		if (doc == null)
			doc = document;
		if (doc.all)
			return document.body.scrollTop;
		else {
			return pageYOffset;
		}
	}
function layerTop(aLayer, y) {
		var lay = getLayer(aLayer);
		if ( lay == null ) return 0;
		layerMoveTo(lay, null, y);
		if ( document.layers ) {
			return lay.top;
		} else if ( document.getElementById ) {
			return lay.offsetTop;
		} else if ( document.all ) {
			return lay.style.posTop != 0 ? lay.style.posTop : lay.offsetTop;
		}
		return 0;
	}
function layerMoveTo( aLayer, x, y) {
		var lay = getLayer(aLayer);
		if ( lay == null ) return false;
		var obj = lay.style ? lay.style : lay;
		if (x) obj.left = x;
		if (y) obj.top = y;
		return true;
	}