function chgStyle(title) {
  var i, a, main;
  if (title) {
    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;
        }
      }
    }
    createCookie('cssstyle', title, 365);
  }
}

function getActiveStyleSheet() {
    var i, a;
    for(i=0; (a = document.getElementsByTagName('link')[i]); i++) {
      if(a.getAttribute('rel').indexOf('style') != -1 && a.getAttribute('title') && !a.disabled) {
        return a.getAttribute('title');
      }
    }
    return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName('link')[i]); i++) {
    if(a.getAttribute('rel').indexOf('style') != -1
       && a.getAttribute('rel').indexOf('alt') == -1
       && a.getAttribute('title')) {
       return a.getAttribute('title');
    }
  }
  return null;
}

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 eraseCookie(name) {
  createCookie(name,'',-1);
}
window.onload = function(e) {
  var cookie = readCookie('cssstyle');
  if (cookie == '' || cookie == null)
    cookie='ten';
  var title = cookie ? cookie : getPreferredStyleSheet();
  chgStyle(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie('cssstyle', title, 365);
}

var wrt = '<form>Font Size <select size=1 name=test onchange="chgStyle(this.options[this.selectedIndex].value)" style="font-size: 10px">';
var sizes = Array(10,12,14,16,18,20);
var names = Array('ten','twelve','fourteen','sixteen','eighteen','twenty');
var cookie = readCookie('cssstyle');
  for (var i=0;i<sizes.length;i++)
  {
    wrt+='<option value="'+names[i]+'"';
    if (cookie==names[i])
      wrt+=' selected'
    wrt+='>'+sizes[i];  
  }
  wrt+='</form>';