window.addEvent('domready', function() {
	position();
	startGalleryRotation('photos', 5000)
});

window.addEvent('resize', function() {
	position();
});


function startGalleryRotation(selector,delay){ 
	var i = 0; 
	var layers = $(selector).getChildren();
	delay = (delay == undefined)? 6000:delay;
	layers.each(function(layer) {
		if(layer.id != 'first') layer.fade('hide');
	}); 
	setInterval(function(){ 
		layers[i].fade('out'); 
		i = (i == layers.length-1)? 0 : i+1; 
		layers[i].fade('in'); 
	},delay); 
} 

function position() {
	var body_height = document.body.clientHeight;
	var body_width = document.body.clientWidth;
	var site_size = $('site').getSize();
	var margin_top = (body_height - site_size.y) / 2;
	if(margin_top < 0) margin_top = 0;
	var margin_left = (body_width - site_size.x) / 2;
	if(margin_left < 0) margin_left = 0;
	$('site').setStyle('margin-top', margin_top);
	$('site').setStyle('margin-left', margin_left);
}