function alert_seen() {
	
	var scrpt  = '/_helpfiles/alert_seen.php';
	var mydata = 'a=1';
	var opt = {
	    method: 'post',
	    postBody: mydata,
	    onSuccess: function(t) { 
	    	//alert(t.responseText);
				close_layer('infolayer');
	    },
	    on404: function(t) {
    	  //Element.update('information', 'Error 404: location "' + t.statusText + '" was not found.');
    	  close_layer('infolayer');
	    },
	    onFailure: function(t) {
	    	  //Element.update('information', 'Error ' + t.status + ' -- ' + t.statusText );
	    	  close_layer('infolayer');
	    },
	    	    
	    asynchronous: true,
	    evalScripts:  false
		}
	 new Ajax.Request(scrpt, opt);
}

function close_layer(what) {
		new Effect.Squish(what);
}
	
function klappen(what) {
		new Effect.toggle(what,'Blind', {duration:1});
}
	
function show_answer(question) {
		var answer = $(question).next(0);
		new Effect.toggle(answer,'Blind', {duration:0.5});
}