function mailAnUser(){
	var usersToAdd = '?Users=';
	var CheckBoxCounter = 1;
	
	while(document.getElementById('Checkbox'+CheckBoxCounter) != null){
		if(document.getElementById('Checkbox'+CheckBoxCounter).checked){
			var userID = document.getElementById('UserID'+CheckBoxCounter).value;
			usersToAdd += userID+'%2C';
		}
		CheckBoxCounter++;
	}
	
	if(usersToAdd=='?Users='){
		alert('Kein User Angegeben!');
	}else{
		popup('Popups/mailAnUser.php'+usersToAdd, 650, 700);
	}
}

function mailAnUserByID(userID){
	popup('Popups/mailAnUser.php?Users='+userID, 650, 700);
}

/**
 * Geborgt bei Webmailer^^
 *
 * Öffnet ein Popup fenster:
 *
 */
function popup(url, width, height)
{
    if (!width) {
        width = 600;
    }
    if (!height) {
        height = 500;
    }

    var name = (new Date()).getTime();
    var param = "toolbar=no,location=no,status=yes,scrollbars=yes,resizable=yes,width=" + width + ",height=" + height + ",left=0,top=0";
    var win = window.open(url, name, param);
    if (!win) {
        alert("A popup window could not be opened. Your browser may be blocking popups for this application.");
    } else {
        if (typeof win.name == 'undefined') {
            win.name = name;
        }
        if (typeof win.opener == 'undefined') {
            win.opener = self;
        }
    }

    //return win;
}


<!-- Original:  Patrick Lewis, mod: W. Jansen -->
<!-- Begin
if (document.layers) {navigator.family = "nn4"}
if (document.all) {navigator.family = "ie4"}
if (window.navigator.userAgent.toLowerCase().match("gecko")) {navigator.family = "gecko"}
overdiv="0";

function popLayer(name,text){
if (document.layers) {navigator.family = "nn4"}
if (document.all) {navigator.family = "ie4"}
if (window.navigator.userAgent.toLowerCase().match("gecko")) {navigator.family = "gecko"}
if (navigator.family == "gecko") {pad="0"; bord="1 bordercolor=black";}else {pad="1"; bord="0";}
desc = "<table cellspacing=0 cellpadding="+pad+" border="+bord+"  bgcolor=#dddddd><tr><td>\n"
        +"<table cellspacing=0 cellpadding=10 border=0 width=100%><tr><td>\n"
        +"Hilfe zu: <u><b>"+name+"</b></u> <a href='#' onClick='hideLayer()'>[X]</a>"
		+"</td></tr><tr><td>\n"
        +text
        +"\n</td></tr></table>\n"
        +"</td></tr></table>";
if(navigator.family =="nn4") {
        document.object1.document.write(desc);
        document.object1.document.close();
        document.object1.left=x+15;
        document.object1.top=y-5;
        }
else if(navigator.family =="ie4"){
        object1.innerHTML=desc;
        object1.style.pixelLeft=x+15;
        object1.style.pixelTop=y-5;
        }
else if(navigator.family =="gecko"){
        document.getElementById('object1').innerHTML=desc;
        document.getElementById('object1').style.left=(x+15)+'px';
        document.getElementById('object1').style.top=(y-5)+'px';
        }
}

function popBild(virtName,physName){
if (document.layers) {navigator.family = "nn4"}
if (document.all) {navigator.family = "ie4"}
if (window.navigator.userAgent.toLowerCase().match("gecko")) {navigator.family = "gecko"}
if (navigator.family == "gecko") {pad="0"; bord="1 bordercolor=black";}else {pad="1"; bord="0";}


desc = "<table cellspacing=0 cellpadding="+pad+" border="+bord+"  bgcolor=#dddddd><tr><td>\n"
        +"<table cellspacing=0 cellpadding=10 border=0 width=100%><tr><td>\n"
        +"Bild: <u><b>"+virtName+"</b></u> <a href='javascript:hideBild()'>[X]</a>"
		+"</td></tr><tr><td>\n"
        +"<img src='../../"+physName+"'>"
        +"\n</td></tr></table>\n"
        +"</td></tr></table>";
        
        
if(navigator.family =="nn4") {
        document.grossesBild.document.write(desc);
        document.grossesBild.document.close();
        document.grossesBild.left=x+15;
        document.grossesBild.top=y-5;
        }
else if(navigator.family =="ie4"){
        grossesBild.innerHTML=desc;
        grossesBild.style.pixelLeft=x+15;
        grossesBild.style.pixelTop=y-5;
        }
else if(navigator.family =="gecko"){
        document.getElementById('grossesBild').innerHTML=desc;
        document.getElementById('grossesBild').style.left=(x+15)+'px';
        document.getElementById('grossesBild').style.top=(y-5)+'px';
        }
}



function popAntworten(PersonID,KursID){
if (document.layers) {navigator.family = "nn4"}
if (document.all) {navigator.family = "ie4"}
if (window.navigator.userAgent.toLowerCase().match("gecko")) {navigator.family = "gecko"}
if (navigator.family == "gecko") {pad="0"; bord="1 bordercolor=black";}else {pad="1"; bord="0";}


antwortenOnMouseOver(KursID,PersonID);
        

if(navigator.family =="nn4") {
        document.Antwort.document.close();
        document.Antwort.left=x+15;
        document.Antwort.top=y-5;
        }
else if(navigator.family =="ie4"){
        Antwort.style.pixelLeft=x+15;
        Antwort.style.pixelTop=y-5;
        }
else if(navigator.family =="gecko"){
		var dasDiv = document.getElementById('Antwort');
        dasDiv.style.left=(x-150)+'px';
        dasDiv.style.top=(y-5)+'px';
        
        dasDiv.style.width = 140+'px';
        }
}



//  versteckt die PopUp-Box
function hideLayer(){
if (overdiv == "0") {
        if(navigator.family =="nn4") {eval(document.object1.top="-500");}
        else if(navigator.family =="ie4"){object1.innerHTML="";}
        else if(navigator.family =="gecko") {document.getElementById("object1").style.top='-500px';}
        }
}

function hideBild(){
if (overdiv == "0") {
        if(navigator.family =="nn4") {eval(document.grossesBild.top="-500");}
        else if(navigator.family =="ie4"){grossesBild.innerHTML="";}
        else if(navigator.family =="gecko") {document.getElementById("grossesBild").style.top='-500px';}
        }
}

function hideAntworten(){
if (overdiv == "0") {
        if(navigator.family =="nn4") {eval(document.Antwort.top="-500");}
        else if(navigator.family =="ie4"){Antwort.innerHTML="";}
        else if(navigator.family =="gecko") {
        	document.getElementById("Antwort").style.top='-500px';
        	document.getElementById("Antwort").innerHTML="Bitte warten!";
        }
        }
}


var isNav = (navigator.appName.indexOf("Netscape") !=-1);

function handlerMM(e){
x = (isNav) ? e.pageX : event.clientX + document.body.scrollLeft;
y = (isNav) ? e.pageY : event.clientY + document.body.scrollTop;
}


if (isNav){document.captureEvents(Event.MOUSEMOVE);}
document.onmousemove = handlerMM;
//  End -->