function showall() {
      setActiveStyleSheet('showall');
}

function hideimages() {
      setActiveStyleSheet('showall_noimages');
}

function hideall() {
      setActiveStyleSheet('hideall');
}

function showa() {

      setActiveStyleSheet('alpha-a');

      }
function showb() {

      setActiveStyleSheet('alpha-b');

      }
function showc() {

      setActiveStyleSheet('alpha-c');

      }
function showd() {

      setActiveStyleSheet('alpha-d');

      }
function showe() {

      setActiveStyleSheet('alpha-e');

      }
function showf() {

      setActiveStyleSheet('alpha-f');

      }
function showg() {

      setActiveStyleSheet('alpha-g');

      }
function showh() {

      setActiveStyleSheet('alpha-h');

      }
function showi() {

      setActiveStyleSheet('alpha-i');

      }
function showj() {

      setActiveStyleSheet('alpha-j');

      }
function showk() {

      setActiveStyleSheet('alpha-k');

      }
function showl() {

      setActiveStyleSheet('alpha-l');

      }
function showm() {

      setActiveStyleSheet('alpha-m');

      }
function shown() {

      setActiveStyleSheet('alpha-n');

      }
function showo() {

      setActiveStyleSheet('alpha-o');

      }
function showp() {

      setActiveStyleSheet('alpha-p');

      }
function showq() {

      setActiveStyleSheet('alpha-q');

      }
function showr() {

      setActiveStyleSheet('alpha-r');

      }
function shows() {

      setActiveStyleSheet('alpha-s');

      }
function showt() {

      setActiveStyleSheet('alpha-t');

      }
function showu() {

      setActiveStyleSheet('alpha-u');

      }
function showv() {

      setActiveStyleSheet('alpha-v');

      }
function showw() {

      setActiveStyleSheet('alpha-w');

      }
function showx() {

      setActiveStyleSheet('alpha-x');

      }
function showy() {

      setActiveStyleSheet('alpha-y');

      }
function showz() {

      setActiveStyleSheet('alpha-z');

      }

function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}