function setActiveStyleSheet(title) {
			  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;
				}
			  }
			}
			
			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);
			}
			
			window.onunload = function(e) {
			  var title = getActiveStyleSheet();
			  createCookie("style", title, 365);
			}
			
			var cookie = readCookie("style");
			var title = cookie ? cookie : getPreferredStyleSheet();
			setActiveStyleSheet(title);