function init_lb(){
	
	$$('a.lightbox').each(function(e){
		e.observe('click', (function(event){
		    var target = event.findElement('a[class^=lightbox]');
			var target = target.down('img');
			
			if (target) {
		        event.stop();
		        open_lb(target);
				hit(target);
		    }
		}).bind(this));		
	});	
	
	var overlay = $(document.createElement('div')).hide();
	overlay.id = 'overlay';
	overlay.setOpacity(0.35);
	overlay.observe('click',close_lb);
	
	var lb = $(document.createElement('div')).hide();
	lb.id = 'lightbox';
	lb.observe('click',close_lb);
	
	var cl = $(document.createElement('div')).hide();
	cl.id = 'cl';
	//cl.update('Fenster schließen');
	cl.observe('click',close_lb);
		
	document.body.appendChild(overlay);
	document.body.appendChild(lb);
	document.body.appendChild(cl);
			
}

function open_lb(target){
	var lb = $('lightbox');
		
	lb.update('Lade Bild...');
	
	var img = $(new Image());
	img.onload = function(){
		lb.update(img);
			
		var dim = img.getDimensions();
			
		var arrayPageScroll = document.viewport.getScrollOffsets();
		var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 5);
		var lightboxLeft = arrayPageScroll[0];
		
		var arrayPageSize = getPageSize();
		$('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' }).show();
		lb.setStyle({ top: lightboxTop+'px', left: lightboxLeft+'px' }).show();
		
		var i = $(lb.firstChild);
		var off = i.cumulativeOffset();
		
		$('cl').setStyle({ top: lightboxTop-30+'px', left: lightboxLeft+off.left+i.getWidth()-32+'px'}).show();
	}
	
	img.src = target.src.replace(/_t/,'');	
}

function close_lb(){
	$('lightbox').hide();
	$('overlay').hide();
	$('cl').hide();
}

function getPageSize() {
        
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	
	if (self.innerHeight) {	// all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			windowWidth = self.innerWidth;
		}
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}
	
	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}
	
	return [pageWidth,pageHeight];
}

function hit(target){
	new Ajax.Request(target.parentNode.href,{
		method: 'get'
	});
}

document.observe('dom:loaded', function () { init_lb(); });