function checkBackButton () {
	return;
	//alert('here we are');

	var value = null;
	var object = 'sessioncounter';
	if(document.layers){
		//thisbrowser="NN4";
		value = document.layers[object].value;
	}
	if(document.all){
		//alert('ie');
		//thisbrowser="ie"
		value = document.all[object].value;
	}
	if(!document.all && document.getElementById){
		//thisbrowser="NN6";
		value = document.getElementById(object).value;
	}

	var alleCookies = document.cookie;
	var cookie = document.cookie.indexOf('sebo=');
	var wert = -1;
	if (cookie > -1) {
		var start = 5;
		var ende = document.cookie.indexOf(";", start);
		if (ende == -1) ende = alleCookies.length;
		wert = alleCookies.substring(start, ende);
		wert = unescape(wert);
	}

	if (wert > -1 && value != null) {
		if (wert != value) {
			//alert ('Wert: '+wert+'   value: '+value);
			location.href='shop.php?action=logout&source=javascript';
		} else {
			//alert ('Alles klar! Wert= '+wert+' value = '+value);
		}
	} else {
		//alert ('Wert: '+wert+'   value: '+value);
	}

}