function changeFontSize(size){

	style_sheet = getActiveStyleSheet();

	if (size == ""){
		size = "default";
	}

	var Size_array = new Array(); 
	Size_array["small"]="0.8em";       
	Size_array["default"]="1em";
	Size_array["medium"]="1.1em";
	Size_array["large"]="1.2em";
	Size_array["x-large"]="1.3em";
	

	if(size != "undefined" && size != ""){
		document.getElementsByTagName('body')[0].style.fontSize = Size_array[size];	

		setColours(style_sheet,size);	
	}
}

function setColours(style_sheet,size){	
	
	document.getElementById("x-large").className = "x-large";
	document.getElementById("large").className = "large";
	document.getElementById("medium").className = "medium";
	document.getElementById("default").className = "default";
	document.getElementById("small").className = "small";
		
	
	if(size == "x-large"){
		document.getElementById("container").style.width = "1060px";
		document.getElementById("footer_content").style.width = "1060px";
		
		document.getElementById("x-large").className = "x-large_selected";

	}else if(size == "large"){
		document.getElementById("container").style.width = "980px";
		document.getElementById("footer_content").style.width = "980px";
		
		document.getElementById("large").className = "large_selected";

	}else if(size == "medium"){
		document.getElementById("container").style.width = "950px";
		document.getElementById("footer_content").style.width = "950px";
		
		document.getElementById("medium").className = "large_selected";

	}else if(size == "default"){
		document.getElementById("container").style.width = "870px";
		document.getElementById("footer_content").style.width = "870px";
		
		document.getElementById("default").className = "large_selected";
		
	}else if(size == "small"){
		document.getElementById("container").style.width = "870px";
		document.getElementById("footer_content").style.width = "870px";
		
		document.getElementById("small").className = "large_selected";

	}

}

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 getPreferredFontSize() {
  
	var Size_array = new Array(); 
	Size_array["0.8em"]="small";       
	Size_array["1em"]="default";
	Size_array["1.1em"]="medium";
	Size_array["1.2em"]="large";
	Size_array["1.3em"]="x-large";
  
  	preferredsize = document.getElementsByTagName('body')[0].style.fontSize;

   if(preferredsize == "" || preferredsize == "undefined"){
  	
  	preferredsize = "1em";
  }

  preferredsize = Size_array[preferredsize];
  
  return preferredsize;
}

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);
  
  var fontcookie = readCookie("fontsize");
  var preferredsize = fontcookie ? fontcookie : getPreferredFontSize();
  changeFontSize(preferredsize);
}

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

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