function openmenu(id){
	if ( ! document.getElementById(id)) {	
		
	}	
	else{			
		e  = document.getElementById(id);
		e.style.display = "block";
		e.style.position = "absolute";
		}
	}
	

function sluitmenu(id){
	if ( ! document.getElementById(id)) {	
			
	}	
	else{
		f  = document.getElementById(id);
		f.style.display = "none";
		}
	}
	

function changebgcolor(id,kleur){

	document.getElementById(id).style.backgroundColor = kleur;
		
}

function changetoref(id,kleur){

	y = document.getElementById(id);
	
	y.style.color = kleur;
	y.style.textDecoration = "underline";		
}

function changetomenu(id,kleur){

	y = document.getElementById(id);
	
	y.style.color = kleur;
	y.style.textDecoration = "none";		
}