function show_hide(object){

show = true;

obj1 = document.getElementById("tekstvolledig").getElementsByTagName("div");

obj2 = document.getElementById(object);

if (obj2.style.display == '')

show = false;

for (i = 0; i < obj1.length; i++) {

obj1[i].style.display = 'none';

}

if (show == true)

obj2.style.display = '';

}