function play(movie, sess, wheight, wwidth) {

    if (! wheight) wheight = 576;
    if (! wwidth) wwidth = 720;

    var wnd = window.open( '/player/members/?movie='+movie+'&sess='+sess,
                            'movie',
                            'left=' + (screen.availWidth/2 - (wwidth/2) ) +
                            ',top='+(screen.availHeight/2 - (wheight/2) ) +
                            ',width=' + wwidth +
                            ',height=' + wheight +
                            ',border=0,scrollbars=0,resize=0' +
                            ',status=0,toolbar=0,menubar=0,location=0'
                        );
    if (!wnd) {
        alert("Wanneer er geen venster opent, moet u geinstalleerde popup-blokkades uitschakelen.");
    } else {
        wnd.focus();
    }
}

function playRentedMovie(uri) {

    var wheight = 320;
    var wwidth = 500;

    var wnd = window.open( uri,
                            'movie',
                            'left=' + (screen.availWidth/2 - (wwidth/2) ) +
                            ',top='+(screen.availHeight/2 - (wheight/2) ) +
                            ',width=' + wwidth +
                            ',height=' + wheight +
                            ',border=0,scrollbars=0,resize=0' +
                            ',status=0,toolbar=0,menubar=0,location=0'
                        );
    if (!wnd) {
        alert("Wanneer er geen venster opent, moet u geinstalleerde popup-blokkades uitschakelen.");
    } else {
        wnd.focus();
    }
}