function changeImage(elem, src) {
    $('#'+elem).attr("src", src);
} 

function playIntroVideo() {
    $('#intro-movie-dialog').dialog({
        draggable: true, 
        minWidth: 660, 
        title: 'Promotievideo'
    });
}

function playRTLVideo() {
    $('#rtl-z-belgie').dialog({
        draggable: true, 
        minWidth: 660, 
        title: 'RTL Z Belgie'
    });
}