function openSubmenu(id){
	closeSubmenus();
	$(id).setStyle('display','block');
}
function closeSubmenus(){
	$('submenu').setStyle('display','none');
}
function makeScrollbar(content,scrollbar,handle,horizontal,ignoreMouse){
	var steps = (horizontal?(content.getSize().scrollSize.x - content.getSize().size.x):(content.getSize().scrollSize.y - content.getSize().size.y));
	if(steps <= 0){
		handle.setStyle('display','none');
		scrollbar.setStyle('background-color','transparent');
	}
	var slider = new Slider(scrollbar, handle, {
		steps: steps,
		mode: (horizontal?'horizontal':'vertical'),
		onChange: function(step){
			// Scrolls the content element in x or y direction.
			var x = (horizontal?step:0);
			var y = (horizontal?0:step);
			content.scrollTo(x,y);
		}
	}).set(0);
	if( !(ignoreMouse) ){
		// Scroll the content element when the mousewheel is used within the
		// content or the scrollbar element.
		$$(content, scrollbar).addEvent('mousewheel', function(e){
			e = new Event(e).stop();
			var step = slider.step - e.wheel * 30;
			slider.set(step);
		});
	}
	// Stops the handle dragging process when the mouse leaves the document body.
	$(document.body).addEvent('mouseleave',function(){slider.drag.stop()});
}
function initJs(){
	// hide overlays
	$$('.overlay').each(function(overlay){
		overlay.setStyle('opacity', 0);
	});

	// attach submenu
	$$('.submenu_opener').each(function(item){
		item.addEvent('mouseover', function(){ openSubmenu('submenu'); });
	});
	$$('.menuitem').each(function(item){
		item.addEvent('mouseover', function(){ closeSubmenus(); });
	});
	closeSubmenus();

	// set bird image location
	var offset = Math.round(Math.max(($('body').getSize().size.x - 950)/2, 0));
	$$('.active').each(function(item){
		var coords = item.getCoordinates();
		var margin = coords.left - offset + 24;
		$('bird').setStyle("margin-left", margin + "px");
	});

}
function initScroller(){
	// create custom scrollbar
	if($('content') != null) makeScrollbar( $('content'), $('scrollbar'), $('handle') );
}
window.addEvent('domready', initJs);
window.addEvent('load', initScroller); // on load because of recaptcha/javascript scoller IE conflict