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

	var pixels='0px';
	
	$$('#boxes a').each(function(el){
		var klasse=el.get('class');
		var namer=el.get('id');
		if(klasse=='on')
		{
			if(namer=='beratung')
			{
				pixels='0px';
			}

			if(namer=='gestaltung')
			{
				pixels='-840px';
			}

			if(namer=='programmierung')
			{
				pixels='-1680px';
			}
		}
	});
	
	$('beratung').addEvent('click',function(el){
		el.stop();	
		$$('#boxes a').set('class','');		
		this.set('class','on');
		$('contentinner').tween('left',pixels,'0px');
		pixels='0px';
	});
	$('gestaltung').addEvent('click',function(el){
		el.stop();	
		$$('#boxes a').set('class','');		
		this.set('class','on');
		$('contentinner').tween('left',pixels,'-840px');
		$('contentinner').tween('left','-840px');
		pixels='-840px';
	});
	$('programmierung').addEvent('click',function(el){
		el.stop();	
		$$('#boxes a').set('class','');		
		this.set('class','on');
		$('contentinner').tween('left',pixels,'-1680px');
		pixels='-1680px';
	});

});