/*
Allows user to select choice of stylesheet
*******************************************************************************
Title       : styleswitcher.js
Amendment History
-----------------
Version in Source Safe   Date        Author      Description
------------------------------------------------------------------------------
2						04/02/08	 Duncan		 First version to be given Source Safe version number.  
												 Changed from original icw Zoomtext facility
*/

function setActiveStyleSheet(title) {
if (title!='null')
{
  var i, a, main;
  if (title=='Standard' || title=='Default')
  {
  if ((screen.width<=800) && (screen.height<=600)) 
	title='Zoom';
  else
	title='Default';
	}
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
	  if (a.getAttribute("title") != title)
		{
			//a.rel="alternate stylesheet"
			a.disabled = true;
		}
      else
      {
			//a.rel="stylesheet"
			a.disabled = true;
			a.disabled = false;
       }
    }
  }
   }
}
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.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

if (window.addEventListener)
window.addEventListener("load", do_Styleload, false)
else if (window.attachEvent)
window.attachEvent("onload", do_Styleload)
else if (document.getElementById)
window.onload=do_Styleload;
function do_Styleload(){
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);
}