function get_url_parameter() {
    var params = {};
    var assignments;
    var i, parts;
    assignments = unescape(location.search.substring(1, location.search.length)).split("&");
    for (i = 0; i < assignments.length; i++) {
        parts = assignments[i].split("=");
        if (parts.length == 2 && parts[1].search(/^[a-zA-Z0-9\/\._-]+$/) == 0)
            params[parts[0]] = parts[1];
    }
    return params;
}

function load_iframes() {
    var params = get_url_parameter();
    if ('thumb' in params)
        thumb.location.href = params['thumb'];
    else
        thumb.location.href = 'art-news.htm';
    if ('main' in params)
        main.location.href = params['main'];
    else
        main.location.href = 'art-leer.htm';
}