function activateTab(tabname) {

  // deal with swapping the images
  var allAnchors = document.getElementsByTagName('a');
  for (i = 0; i < allAnchors.length; i++) {
    if (allAnchors[i].className == "tab"
      && allAnchors[i].id != tabname)
    {
      allAnchors[i].style.backgroundPosition = "0 0";
    }
  }
  var tab = document.getElementById(tabname);
  tab.style.backgroundPosition = "0 0";

  var divname = tabname + '_div';
  activateDiv(divname);
}

// sets the style of div 'divname' to 'block'; sets all other divs belonging
// to divname's class to 'none'
function activateDiv(divname) 
{

  var allDivs = document.getElementsByTagName('div');
  var tab = document.getElementById(divname);
  var thisClass = tab.className;
  for (i = 0; i < allDivs.length; i++) {
    if (allDivs[i].className == thisClass && allDivs[i].id != divname) {
      allDivs[i].style.display = 'none';
    }
  }
  tab.style.display = 'block';

}

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