function bg(){
	
	if(screen.width <= 1281){
		
	          document.body.style.backgroundImage='url(http://www.happywoka16.com/images/achtergrond/1280.jpg)';
	          document.body.style.backgroundRepeat='no-repeat';
	          document.body.style.backgroundPosition='center center';
	    
        } else if(screen.width <= 1367){
		
	          document.body.style.backgroundImage='url(http://www.happywoka16.com/images/achtergrond/1366.jpg)';
	          document.body.style.backgroundRepeat='no-repeat';
	          document.body.style.backgroundPosition='center center';
		   
        } else if(screen.width <= 1441){
		
	          document.body.style.backgroundImage='url(http://www.happywoka16.com/images/achtergrond/1440.jpg)';
	          document.body.style.backgroundRepeat='no-repeat';
	          document.body.style.backgroundPosition='center center';
		   
        } else if(screen.width <= 1601){
		
	          document.body.style.backgroundImage='url(http://www.happywoka16.com/images/achtergrond/1600.jpg)';
	          document.body.style.backgroundRepeat='no-repeat';
	          document.body.style.backgroundPosition='center center';
		   
        } else if(screen.width <= 1681){
		
	          document.body.style.backgroundImage='url(http://www.happywoka16.com/images/achtergrond/1680.jpg)';
	          document.body.style.backgroundRepeat='no-repeat';
	          document.body.style.backgroundPosition='center center';
		   
        } else {
		
            document.body.style.backgroundImage='url(http://www.happywoka16.com/images/achtergrond/1920.jpg)';
	    document.body.style.backgroundRepeat='no-repeat';
	    document.body.style.backgroundPosition='center center';
	    
        }
	
}