// Navigation im IE
sfHover = function() {
	var sfEls = document.getElementById("navigation").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

// newsletteroptionen ein-/ ausblenden
var actObj='subscribe';
function show(obj) {
	if(actObj!=''&&actObj==obj) {
		document.getElementById(actObj).style.visibility='hidden';
		actObj='';
	}
	else {
		if(actObj!='') document.getElementById(actObj).style.visibility='hidden';
		if(obj!='') document.getElementById(obj).style.visibility='visible';
		actObj=obj;
	}
}

function openAgb() {
	window.open('agb.php','agb','width=820,height=500,scrollbars=no');
}


function switchws()
{
	var selbox = document.getElementById('subject');
	var ws_id = selbox.options[selbox.selectedIndex].value;
	if (ws_id > 0 && ws_id < 9999) {
		var elements = document.getElementsByName("lessondiv");
	    for ( var x = 0; x < elements.length; x++ ) {
			elements[x].style.visibility = "hidden";
			elements[x].style.display = "none";
	    }
		
		var mydiv = document.getElementById('lesson'+ws_id);
		if (mydiv != null) {
			mydiv.style.display = 'block';
			mydiv.style.visibility = 'visible';
		}
		var mydiv = document.getElementById('wsanmeldung');
		if (mydiv != null) {
			mydiv.style.display = 'block';
			mydiv.style.visibility = 'visible';
		}
		var mydiv = document.getElementById('wsagb');
		if (mydiv != null) {
			mydiv.style.display = 'block';
			mydiv.style.visibility = 'visible';
		}
		
	}
	else {
		var elements = document.getElementsByName("lessondiv");
	    for ( var x = 0; x < elements.length; x++ ) {
			elements[x].style.display = "none";
			elements[x].style.visibility = "hidden";
	    }

		var mydiv = document.getElementById('wsanmeldung');
		if (mydiv != null) {
			mydiv.style.display = 'none';
			mydiv.style.visibility = 'hidden';
		}
		var mydiv = document.getElementById('wsagb');
		if (mydiv != null) {
			mydiv.style.display = 'none';
			mydiv.style.visibility = 'hidden';
		}	
	}
}