function fnSwitchLetter(selected){
    var i = 1;
    for (i=1;i<=4;i++){
     if (document.getElementById('imgLetter_' + i) && document.getElementById('lnkLetter_' + i)){
       document.getElementById('imgLetter_' + i).style.display = (i == selected) ? "inline" : "none";
       document.getElementById('lnkLetter_' + i).className = (i == selected) ? "lnkLetterCurrent" : "lnkLetter";
     }
    }
   }

    function fnOpenPic(src){
      var win = window.open(src, '_pic', 'width=545px,height=384px, resizable=yes, scrollbars=yes, status=no, titlebar=no,menubar=no');
      if (win) win.focus();
    }