// From: http://www.webdeveloper.com/forum/sh...d.php?t=212715

function showhide(id) {
if (document.getElementById) {
obj = document.getElementById(id);
if (obj.style.display == "") {
obj.style.display = "none";
} else {
obj.style.display = "";
}
}
}

function hide(id) {
if (document.getElementById) {
obj = document.getElementById(id);
if (obj.style.display == "none") {
obj.style.display = "none";
} else {
obj.style.display = "none";
}
}
}

function hideall(id1,id2,id3,id4) {
var status1 = document.getElementById(id1).style.display;
var status2 = document.getElementById(id2).style.display;
var status3 = document.getElementById(id3).style.display;
var status4 = document.getElementById(id4).style.display;
if ((status1 == 'none') || (status2 == 'none') || (status3 = 'none') || (status4 = 'none')) {
hide(id1); hide(id2); hide(id3); hide(id4); return;
}
if ((status1 != 'none') || (status2 != 'none') || (status3 != 'none') || (status4 != 'none')) {
hide(id1); hide(id2); hide(id3); hide(id4); return;
}
}

function show(id) {
if (document.getElementById) {
obj = document.getElementById(id);
if (obj.style.display == "") {
obj.style.display = "";
} else {
obj.style.display = "";
}
}
}

function showall(id1,id2,id3, id4) {
var status1 = document.getElementById(id1).style.display;
var status2 = document.getElementById(id2).style.display;
var status3 = document.getElementById(id3).style.display;
var status4 = document.getElementById(id4).style.display;
if ((status1 == 'none') || (status2 == 'none') || (status3 = 'none') || (status4 = 'none')) {
show(id1); show(id2); show(id3); show(id4); return;
}
if ((status1 != 'none') || (status2 != 'none') || (status3 != 'none') || (status4 != 'none')) {
show(id1); show(id2); show(id3); show(id4); return;
}
}