function setActiveStyleSheet(title,flag) 
{
  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;
    }
  }
  if(flag)
  {
	  switch (title)
	  {
		  case "style1" : 
						  document.getElementById("t1").className='on';	
						  document.getElementById("t2").className='';
						  document.getElementById("t3").className='';
						  document.getElementById("t4").className='';
							document.getElementById("t5").className='';
							break;
		 case "style2" : 
		 					document.getElementById("t1").className='';
						  document.getElementById("t2").className='on';
						  document.getElementById("t3").className='';
						  document.getElementById("t4").className='';
							document.getElementById("t5").className='';
							break;
		  case "style3" : 
							document.getElementById("t1").className='';
						  document.getElementById("t2").className='';
						  document.getElementById("t3").className='on';
						  document.getElementById("t4").className='';
							document.getElementById("t5").className='';
							break;
		  case "style4" : 
							document.getElementById("t1").className='';
						  document.getElementById("t2").className='';
						  document.getElementById("t3").className='';
						  document.getElementById("t4").className='on';
							document.getElementById("t5").className='';
							break;
			case "style5" : 
							document.getElementById("t1").className='';
						  document.getElementById("t2").className='';
						  document.getElementById("t3").className='';
						  document.getElementById("t4").className='';
							document.getElementById("t5").className='on';
							break;
	  }
  }
}

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;
}

window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title,true);
}

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

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title,false);