you need to find and modify the div elements named graphical as well. For example for a "select" question named "TYPE", this is how you would hide the graphical checkbox
document.getElementById("TYPE_2_graphical").visibility = 'hidden';
document.getElementById("TYPE_2_graphical").disabled = 'true';
document.getElementById("TYPE_2_graphical").className = 'HideElement';
you need to do this for the label text as well.