var cvsSSlink;
var hydra = document.getElementsByTagName("head");
hydra = hydra[0];

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

function setStyleSheet(sheet) {
  unlnk();
  cvsSSlink=document.createElement("link");
  cvsSSlink.href = cssRoot + sheet;
  cvsSSlink.id = "cvsstyle";
  cvsSSlink.rel="stylesheet";
  cvsSSlink.type="text/css";

  hydra.appendChild(cvsSSlink);
}

function unlnk() {
  var link = document.getElementById("cvsstyle");
  if(!link) return;
  hydra.removeChild(link);
}

window.onload = function(e) {
  var cookie = readCookie("cvslook");
  var cssuri = cookie ? cookie : "cvs_dft.css";
  setStyleSheet(cssuri);
}

window.onunload = function(e) {
  var cssuri = document.getElementById("cvsstyle").href.replace(/.*\//, '');
  createCookie("cvslook", cssuri, 365);
}

var cookie = readCookie("cvslook");
var cssuri = cookie ? cookie : "cvs_dft.css";
setStyleSheet(cssuri);