function moveIdent(window_scroll, bottom_limit) {
    panier_div = $('top_cont');
    if (panier_div == null) {
        return;
    }
    coords = panier_div.getCoordinates();
 
    margin_top = panier_div.getStyle('margin-top');
    if (margin_top == null || margin_top.length == 0) {
        margin_top = 0;
    } else {
        if (margin_top.test('px$', 'i') == true) {
            margin_top = margin_top.toInt();
        } else {
            // ERROR
            return;
        }
    }
    margin_bottom = panier_div.getStyle('margin-bottom');
    if (margin_bottom == null || margin_bottom.length == 0) {
        margin_bottom = 0;
    } else {
        if (margin_bottom.test('px$', 'i') == true) {
            margin_bottom = margin_bottom.toInt();
        } else {
            // ERROR
            return;
        }
    }
 
    zeroPos = coords.top - margin_top;
    maximumMargin = bottom_limit - coords.height - margin_bottom - zeroPos;
 
    if (margin_top > maximumMargin) {
        panier_div.setStyle('margin-top', maximumMargin);
        margin_top = maximumMargin;
    }
 
    requiredPos = window_scroll + 5;
    final_margin = requiredPos - zeroPos;
 
    if (final_margin > maximumMargin) {
        final_margin = maximumMargin;
    } if (final_margin < 0) {
        final_margin = 0;
    }
 
    if (final_margin != margin_top) {
        if (fxPanier == null) {
            fxPanier = new Fx.Style(panier_div, 'margin-top', {duration:300});
        }
        fxPanier.stop();
        fxPanier.start(final_margin);
    }
}

window.onscroll = resize_scroll;
window.onresize = resize_scroll;

var fxPanier = null;


function resize_scroll(e) {
	window_scroll = window.getScrollTop();
	footer_div = $('footer');
	if (footer_div == null) {
		// ERROR :
		return;
	}
	footertoppos = footer_div.getCoordinates().top;
	footermargintop = footer_div.getStyle('margin-top');
	if (footermargintop == null || footermargintop.length == 0) {
		footermargintop = 0;
	} else {
		if (footermargintop.test('px$', 'i') == true) {
			footermargintop = footermargintop.toInt();
		} else {
			// ERROR
			return;
		}
	}

	bottom_limit = footertoppos - footermargintop;
	bottom_limit -= 20; // security;

	moveIdent(window_scroll, bottom_limit);
}