function parseWLS() {
    var winLocSearchString, searchParams;
    
/*
    document.writeln('<p>|' + window.location.search + '|<\/p>');
*/
    winLocSearchString = window.location.search;
    winLocSearchString = winLocSearchString.substring(1, winLocSearchString.length);    
    searchParams = winLocSearchString.split("&"); 
/*
    document.writeln('<p>|' + winLocSearchString + '|<\/p>');
    for (var i=0; i < searchParams.length; ++i)
      document.writeln('<p>searchParams[' + i + ']=|' + searchParams[i] + '|<\/p>');
*/
    pic_dir = searchParams[0].substring(searchParams[0].indexOf("=") + 1, searchParams[0].length);
    pic_nr = searchParams[1].substring(searchParams[1].indexOf("=") + 1, searchParams[1].length);
    pic_max = searchParams[2].substring(searchParams[2].indexOf("=") + 1, searchParams[2].length);

    picnr_curr = parseInt(pic_nr, 10);
    picnr_prev = picnr_curr - 1;
    picnr_next = picnr_curr + 1;
    picnr_last = parseInt(pic_max, 10);
    
}