http://www.mheadrace.org/graphics_system/resp_universal/js/contractableheaders.js

1/***********************************************
2* Contractible Headers script- © Dynamic Drive (www.dynamicdrive.com)
3* This notice must stay intact for legal use. Last updated Mar 23rd, 2004.
4* Visit http://www.dynamicdrive.com/ for full source code
5***********************************************/
6
7var enablepersist="off" //Enable saving state of content structure using session cookies? (on/off)
8
9var collapseprevious="yes" //Collapse previously open content when opening present? (yes/no)
10
11if (document.getElementById){
12document.write('<style type="text/css">')
13document.write('.switchcontent{display:none;}')
14document.write('</style>')
15}
16
17function getElementbyClass(classname){
18ccollect=new Array()
19var inc=0
20var alltags=document.all? document.all : document.getElementsByTagName("*")
21for (i=0; i<alltags.length; i++){
22if (alltags[i].className==classname)
23ccollect[inc++]=alltags[i]
24}
25}
26
27function contractcontent(omit){
28var inc=0
29while (ccollect[inc]){
30if (ccollect[inc].id!=omit)
31ccollect[inc].style.display="none"
32inc++
33}
34}
35
36function expandcontent(cid){
37if (typeof ccollect!="undefined"){
38if (collapseprevious=="yes")
39contractcontent(cid)
40document.getElementById(cid).style.display=(document.getElementById(cid).style.display!="block")? "block" : "none"
41}
42}
43
44function revivecontent(){
45contractcontent("omitnothing")
46selectedItem=getselectedItem()
47selectedComponents=selectedItem.split("|")
48for (i=0; i<selectedComponents.length-1; i++)
49document.getElementById(selectedComponents[i]).style.display="block"
50}
51
52function get_cookie(Name) { 
53var search = Name + "="
54var returnvalue = "";
55if (document.cookie.length > 0) {
56offset = document.cookie.indexOf(search)
57if (offset != -1) { 
58offset += search.length
59end = document.cookie.indexOf(";", offset);
60if (end == -1) end = document.cookie.length;
61returnvalue=unescape(document.cookie.substring(offset, end))
62}
63}
64return returnvalue;
65}
66
67function getselectedItem(){
68if (get_cookie(window.location.pathname) != ""){
69selectedItem=get_cookie(window.location.pathname)
70return selectedItem
71}
72else
73return ""
74}
75
76function saveswitchstate(){
77var inc=0, selectedItem=""
78while (ccollect[inc]){
79if (ccollect[inc].style.display=="block")
80selectedItem+=ccollect[inc].id+"|"
81inc++
82}
83
84document.cookie=window.location.pathname+"="+selectedItem
85}
86
87function do_onload(){
88uniqueidn=window.location.pathname+"firsttimeload"
89getElementbyClass("switchcontent")
90if (enablepersist=="on" && typeof ccollect!="undefined"){
91document.cookie=(get_cookie(uniqueidn)=="")? uniqueidn+"=1" : uniqueidn+"=0" 
92firsttimeload=(get_cookie(uniqueidn)==1)? 1 : 0 //check if this is 1st page load
93if (!firsttimeload)
94revivecontent()
95}
96}
97
98
99if (window.addEventListener)
100window.addEventListener("load", do_onload, false)
101else if (window.attachEvent)
102window.attachEvent("onload", do_onload)
103else if (document.getElementById)
104window.onload=do_onload
105
106if (enablepersist=="on" && document.getElementById)
107window.onunload=saveswitchstate