function getElementsByClassName(oElm, strTagName, strClassName){
  var arrElements = (strTagName == '*' && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
  var arrReturnElements = new Array();
  strClassName = strClassName.replace(/\-/g, '\\-');
  var oRegExp = new RegExp('(^|\\s)' + strClassName + '(\\s|$)');
  var oElement;
  for(var i=0; i<arrElements.length; i++) {
    oElement = arrElements[i];
    if(oRegExp.test(oElement.className)) arrReturnElements.push(oElement);
  }
  return (arrReturnElements);
}


function closeInfobox() {
  infobox = getElementsByClassName(document,'blockquote','infobox_frame');
  for(var i = 0; i < infobox.length; i++) { infobox[i].style.display = 'none'; }
}


function hide_all_popups() {
  var popups = getElementsByClassName(document,'*', 'popup');
  for(i = 0; i < popups.length; i++) { popups[i].style.display = 'none'; }
}

function hide_all_msf_views() {
  var views = getElementsByClassName(document,'*', 'msf_info');
  for(i = 0; i < views.length; i++) { views[i].style.display = 'none'; }
}

function reset_all_butt_states() {
    document.getElementById('butt1').src = '/images/msf_registration/butt1off.jpg';
    document.getElementById('butt2').src = '/images/msf_registration/butt2off.jpg';
    document.getElementById('butt3').src = '/images/msf_registration/butt3off.jpg';
    document.getElementById('butt4').src = '/images/msf_registration/butt4off.jpg';     
    document.getElementById('butt5').src = '/images/msf_registration/butt5off.jpg';
    document.getElementById('butt6').src = '/images/msf_registration/butt6off.jpg';
}

loadedImages = null;

function loadImages(){
   var img
   if (document.images){
      if (!loadedImages) loadedImages = new Array()
      for (var i=0; i < arguments.length; i++){
         img = new Image()
         img.src = arguments[i]
         loadedImages[loadedImages.length] = img
      }
   }   
}

function preload_msf_images()
{
    loadImages('/images/msf_registration/butt1on.jpg', '/images/msf_registration/butt2on.jpg', '/images/msf_registration/butt3on.jpg', '/images/msf_registration/butt4on.jpg','/images/msf_registration/butt5on.jpg','/images/msf_registration/butt6on.jpg');
    
   /* 
    msf_view_select('my_shaw_info6','butt6', 'butt6on.jpg');
    msf_view_select('my_shaw_info5','butt5', 'butt5on.jpg');
    msf_view_select('my_shaw_info4','butt4', 'butt4on.jpg');
    msf_view_select('my_shaw_info3','butt3', 'butt3on.jpg');
    msf_view_select('my_shaw_info2','butt2', 'butt2on.jpg');
    */
    msf_view_select('my_shaw_info1','butt1', '/images/msf_registration/butt1on.jpg');
}

function msf_view_select(viewId, buttId, buttOnImage)
{
    reset_all_butt_states();
    hide_all_msf_views();
    document.getElementById(viewId).style.display = 'block';
    
    if (document.images){
      document[buttId].src = buttOnImage;
   }
}