var prefsLoaded = false;
	var defaultFontSize = 10;
	var currentFontSize = defaultFontSize;
		
     function changeFontSize(sizeDifference){	  
	 	  	  
	  if ((currentFontSize > 14 && sizeDifference == 1) || (currentFontSize < 10 && sizeDifference == -1))	{}
	  else {
		if(currentFontSize == 10){
	  		currentFontSize = parseInt(currentFontSize) + sizeDifference*2;    	    
	  		setFontSize();
		}
		else{	    
	  		currentFontSize = parseInt(currentFontSize) + sizeDifference*2;	      	    
	  		setFontSize();
		} 
		
	  }  
	};
		
	function reset (){	   
		currentFontSize = defaultFontSize;
		setFontSize();      
	};
	

	function setFontSize (){	
	    document.getElementsByTagName("body")[0].style.fontSize = currentFontSize + 'pt';
	    // navigation-width is 170px: 170-12 =158px have to add
	       
	};
	
	
	function createCookie(name,value,days) {
		
  		if (days != null) {					
    			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 setUserOptions(){
					
		if(!prefsLoaded){						
			cookie = readCookie("fontSize");
			currentFontSize = cookie ? cookie : defaultFontSize;
			setFontSize();		
			prefsLoaded = true;
		}	
				
	};

	window.onunload = saveSettings;
	
	function saveSettings()
	{	
	  
	  createCookie("fontSize", currentFontSize, 365);	  
	};