function getWindowHeight() 
{
	var windowHeight = 0;
	if (typeof(window.innerHeight) == 'number') 
	{
		windowHeight = window.innerHeight;
	}
	else 
	{
		if (document.documentElement && document.documentElement.clientHeight) 
		{
			windowHeight = document.documentElement.clientHeight;
		}
		else 
		{
			if (document.body && document.body.clientHeight) 
			{
				windowHeight = document.body.clientHeight;
			}
		}
	}
	return windowHeight;
}

function calcContentHeight() 
{
	var windowHeight = getWindowHeight();
	if(document.getElementById('footer'))
	{
		var footerHeight = document.getElementById('footer').offsetHeight;
		document.getElementById('content').style.height = parseInt(windowHeight - footerHeight) + 'px';
	}
}

window.onload = function() 
{
	var cookie = readCookie("style");
	
	if(typeof(cookie) == "string" && cookie == "null")
	{
		var title = getPreferredStyleSheet();
	}
	else if(typeof(cookie) == "object" && cookie == null)
	{
		var title = getPreferredStyleSheet();
	}
	else
	{
		var title = cookie;
	}
	
	setActiveStyleSheet(title);
	calcContentHeight();
}

window.onresize = function() 
{
	calcContentHeight();
}

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;
      	createCookie("style", 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 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 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 "standard";
}