function dimm(){
    for (j=1; j<= 7; j++){
        var obj = document.getElementById('o_uitleg_'+j);
        obj.style.display = 'none';
    }
}
function uitleg(i) {
    
	
	var obj = document.getElementById('o_uitleg_' + i);

	switch(obj.style.display)
    {
    case "none":
    dimm();
     obj.style.display = 'block';
    break;
    case "block":
     dimm();
    break;
    }
    
	
}