var foundIE = false;
var isIE = false;

function isIE6orLower() {
  if (foundIE == true) { return isIE; }
  s = window.navigator.userAgent.indexOf("MSIE");
  if (s >= 0)  {
    y = eval(window.navigator.userAgent.substring(s+5,s+6));
    if (y < 7) {
      isIE = true;
    }
  }
  foundIE = true;
  return isIE;
}