style = "800x600";

window.onresize = adjustStyleToSize;
adjustStyleToSize();


function changeStyle(s) {
  if (style == s) return;
  if (!document.getElementsByTagName) return;
  el = document.getElementsByTagName("link");
  for (i = 0; i < el.length; i++ ) {
    if (el[i].getAttribute("rel").indexOf("style") != -1 && el[i].getAttribute("title")) {
      el[i].disabled = true;
      if (el[i].getAttribute("title") == s) el[i].disabled = false;
    }
  }
  style = s;
}

function adjustStyleToSize() {
  if (window.innerWidth) {
    width = window.innerWidth;
  } else {
    width = document.body.clientWidth;
  }

  if (width > 1250) changeStyle("1280x960");
  else if (width > 1000) changeStyle("1024x768");
  else changeStyle("800x600");
}