function checkEntries() {

    var errorMsg = 'Bitte alle Pflichtfelder (*) angeben!';
    var error    = false;
    
    for (var i=1; i<checkEntries.arguments.length; i++) {
        if(document.getElementById(checkEntries.arguments[i]).value.length==0) { 
            error = true;
        }
    }
    if(error) {
        alert(errorMsg); 
        return false;
    } else {
        document.getElementById(checkEntries.arguments[0]).submit();
    }
}

function popupWindow(url) {
    var popupWindow = window.open(url, "PopupFenster", "width=600,height=350,left=150,top=150,status=yes,scrollbars=no");
}

function openPictureWindow(url) {
    var pictureWindow = window.open(url, "PopupFenster", "width=100,height=100,left=150,top=150,status=yes,scrollbars=no");
}

function resizeWindowByPicture(objektID) {
    if(document.getElementById(objektID)) {
        window.resizeTo(document.getElementById(objektID).width+50,document.getElementById(objektID).height+75);
    }
}