window.addEvent('domready', function(){

	var t = $$("a[rel=external]");
	t.each(function(lnk, nr){
		lnk.set({'target':'_blank'}).addClass('external');									
	});
	
	if($chk($('intro_overlay'))){ 
		$('intro_overlay').setStyle('visibility', 'visible');
		resize_overlay();
		position_container();
		window.addEvent('resize', function(){resize_overlay(); position_container();});
	
		$('intro_top').getElement('a[class=close]').addEvent('click', function(){$('intro_overlay').fade('out')});	
	}
	
});

function resize_overlay(){
	var scrollSize = $(window).getScrollSize().y;
	var scrollTop = $(window).getScroll().y;
	$('intro_overlay').setStyles({ 'height':scrollSize+scrollTop,'top':-scrollTop });
}

function position_container(){
	var top = $(window).getSize().y/2;
	$('intro_container').setStyles({'top':top});
}