var standardStyle = 'spStyle9';
var expDays = 9999;  
var nameOfCookie = 'switchstyle';

function TakesCookies()
{
    var GetsCookie = (navigator.cookieEnabled)?true:false
    if(typeof navigator.cookieEnabled=="undefined" && !cookieEnabled)
    {
        document.cookie = "SampleCookie";
        GetsCookie = (document.cookie.indexOf("SampleCookie")!=-1)?true:false
    }
    return GetsCookie;
}

function getAllSheets() {

var fontSize = GetCookie(nameOfCookie);
   if (fontSize == null) {
	fontSize = standardStyle;
   }

  if( !window.ScriptEngine && navigator.__ice_version ) {
    return document.styleSheets; }
  if( document.getElementsByTagName ) {
    var Lt = document.getElementsByTagName('link');
    var St = document.getElementsByTagName('style');
  } else if( document.styleSheets && document.all ) {
    var Lt = document.all.tags('LINK'), St = document.all.tags('STYLE');
  } else { return []; } //lesser browser - return a blank array
  for( var x = 0, os = []; Lt[x]; x++ ) {
    if( Lt[x].rel ) { var rel = Lt[x].rel;
    } else if( Lt[x].getAttribute ) { var rel = Lt[x].getAttribute('rel');
    } else { var rel = ''; }
    if( typeof( rel ) == 'string' &&
        rel.toLowerCase().indexOf('style') + 1 ) {
      os[os.length] = Lt[x];
    }
  }
  for( var x = 0; St[x]; x++ ) { os[os.length] = St[x]; } return os;
}

function changeStyle(value) {

	var newStyle = GetCookie(nameOfCookie);
	if (newStyle == null) {
	    if(TakesCookies())
	    {
	    }
	    else
	    {
		alert("This browser does not accept cookies! Due to this we cannot customise the site for you");
	    }	
	     newStyle = standardStyle;	
	}
	value = newStyle;

  for( var x = 0, ss = getAllSheets(); ss[x]; x++ ) {
    //for each stylesheet ...
    if( ss[x].title ) {
      //disable the stylesheet if it is switchable
      ss[x].disabled = true;
    }
    for( var y = 0; y < arguments.length; y++ ) {
      //check each title ...
      if( ss[x].title == arguments[y] ) {
        //and re-enable the stylesheet if it has a chosen title
        ss[x].disabled = false;
      }
    }
  }
  if( !ss.length ) { alert( 'Your browser cannot change stylesheets' ); }
}

function prettify(underscoreStyleName) {
    var prettyName = "";
    var spacer = "";
    var nameParts = underscoreStyleName.split('_');
    for (i = 0 ; i < nameParts.length ; i++) {
        prettyName += spacer + nameParts[i].substring(0,1).toUpperCase() + nameParts[i].substring(1);
        spacer = " ";
    }
    return prettyName;
}

var exp = new Date(); 
exp.setTime(exp.getTime() + (expDays*24*60*60*1000));

// Function to get the settings of the user
function getCookieVal (offset) {  
	var endstr = document.cookie.indexOf (";", offset);  
	if (endstr == -1)    
	endstr = document.cookie.length;  
	return unescape(document.cookie.substring(offset, endstr));
}
	
// Function to get the settings of the user
function GetCookie (name) {  
	var arg = name + "=";  
	var alen = arg.length;  
	var clen = document.cookie.length;  
	var i = 0;  
	while (i < clen) {    
		var j = i + alen;    
		if (document.cookie.substring(i, j) == arg)      
		return getCookieVal (j);    
		i = document.cookie.indexOf(" ", i) + 1;    
		if (i == 0) break;   
	}  
	return null;
}

// Function to remember the settings
function SetCookie (name, value) {

      var argv = SetCookie.arguments;
      var argc = SetCookie.arguments.length;
      var expires = (argc > 2) ? argv[2] : null;
      expires = "";
      var path = "/";
      var domain = (argc > 4) ? argv[4] : null;
      var secure = (argc > 5) ? argv[5] : false;
      document.cookie = name + "=" + escape (value) +
        ((expires == null) ? "" : ("; expires=" + exp.toGMTString())) +
        ((path == null) ? "" : ("; path=" + path)) +
        ((domain == null) ? "" : ("; domain=" + domain)) +
        ((secure == true) ? "; secure" : "");
     changeStyle(value);   
}

// Function to remove the settings
function DeleteCookie (name) {  
	var exp = new Date();  
	exp.setTime (exp.getTime() - 1);  
	var cval = GetCookie (name);  
	document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}


changeStyle(standardStyle);