var map_image_url = new Array();
function preLoadMapImages() {
    //var map_image_url = new Array();
    map_image_url[0] = mapUrl + "nlmap_drenthe.png";
    map_image_url[1] = mapUrl + "nlmap_flevoland.png";
    map_image_url[2] = mapUrl + "nlmap_friesland.png";
    map_image_url[3] = mapUrl + "nlmap_gelderland.png";
    map_image_url[4] = mapUrl + "nlmap_groningen.png";
    map_image_url[5] = mapUrl + "nlmap_limburg.png";
    map_image_url[6] = mapUrl + "nlmap_noordbrabant.png";
    map_image_url[7] = mapUrl + "nlmap_noordholland.png";
    map_image_url[8] = mapUrl + "nlmap_overijssel.png";
    map_image_url[9] = mapUrl + "nlmap_utrecht.png";
    map_image_url[10] = mapUrl + "nlmap_zeeland.png";
    map_image_url[11] = mapUrl + "nlmap_zuidholland.png";
    if (document.images) {
        var preload_image_object = new Image();
        for (var i=0; i <= 12; i++) {
            preload_image_object.src = map_image_url[i];
        }
    }
}

function imageExists(imageUrl){
    for (var i=0; i <= 12; i++) {
        if (imageUrl==map_image_url[i]){
            return true;
        }
    }
    return false;
}

function mapOver(provincie) {
    document.getElementById("nlMap").src = mapUrl + 'nlmap_' + provincie + '.png';
    $j("#link_"+provincie).addClass('highlight');
}
function mapOut(provincie) {
    document.getElementById("nlMap").src = mapUrl + 'nlmap.png';
    $j("#link_"+provincie).removeClass('highlight');
}

function mapClick(provincie){
    window.open($j("#link_"+provincie).attr("href"));
}