function changeStyleSheetSmall()
{
    var sCurrent = getActiveStyleSheet();
	switch (sCurrent)
	{
		case 'fontsize_small' :
			break;
		case 'fontsize_standard' :
			setActiveStyleSheet('fontsize_small');
			break;
	    case 'fontsize_large' :
			setActiveStyleSheet('fontsize_standard');
			break;
	}
    
}

function changeStyleSheetLarge()
{
    var sCurrent = getActiveStyleSheet();
	switch (sCurrent)
	{
		case 'fontsize_large' :
			break;
	    case 'fontsize_standard' :
			setActiveStyleSheet('fontsize_large');
			break;
	    case 'fontsize_small' :
			setActiveStyleSheet('fontsize_standard');
			break;
	}
}


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.getAttribute("title") != "" && !a.disabled)
		{
			return a.getAttribute("title");
		}
	}
	return "fontsize_standard";
}

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);