/* global variables */
var section;

/* just a bit of browser sniffing is necessary. */

var ie = (document.all) ? true: false; 
var isWin = (navigator.platform.indexOf("Win") != -1) ? true : false;

var ieWin = (ie && isWin) ? true : false;

var ieWin50 = (isWin && navigator.appVersion.indexOf('MSIE 5.0') != -1) ? true : false;


/* the menu open/close function. */

function togglemenu(num) { 
	/* only execute in 5+ browsers. */
	if (!document.getElementById) return false;

	x = 1
	while(document.getElementById("sub" + x)) {
		document.getElementById("sub" + x).style.display = "none"
		x++
	}
	/* set local variables. */
	var submenu = "sub"+num;
	var square = "sq"+num;

	/* Set the display style to "none" if the value is null */
	if (document.getElementById(submenu).style.display == null) {
		document.getElementById(submenu).style.display = "none";
	}
 
	/* The toggle section. 
	If the value of the submenu element's display is "none", then it's set to "block"; if the value is "block", it's set to "none".
	The plus/minus GIF is also reset accordingly.
	*/

	if (document.getElementById(submenu).style.display == "none") {
		document.getElementById(submenu).style.display = "block";
		//document.getElementById(square).src = "images/minus.gif";
	} else {
		document.getElementById(submenu).style.display = "none";
		//document.getElementById(square).src = "images/plus.gif";
	}
	this_display = ""
	x = 1
	while(document.getElementById("sub" + x)) {
		this_display += (document.getElementById("sub" + x).style.display != "none") ? "block" : "none" ;
		this_display += ":"
		x++
	}
	document.cookie = "save_menu=" + this_display
}


/* Get all the elements with a given class name */

function getElementsByClassName(tagname, classname) {

/* only execute in 5+ browsers. */
if (!document.getElementById) return false;

/* get all elements with the tag name tagname. */

var TagElements = document.getElementsByTagName(tagname);

/* define an array which will hold the elements with the class name classname. */
var elementsByClassName = new Array();

/* Look at all the elements in TagElements, and find the ones with the class name classname. */

for (i=0; i<TagElements.length; i++) {
  if (TagElements[i].className == classname) {
    elementsByClassName[elementsByClassName.length] = TagElements[i];
    }
 }
  return elementsByClassName;
}


/* show or hide all elements on a page with a given tag name and class name. */

function showhideclass(tagname,classname,displaystate) {
 var toshowhide = getElementsByClassName(tagname,classname);
  for (k=0; k < toshowhide.length; k++) {
    toshowhide[k].style.display = displaystate;
 }
}

/* change the background color on a page with a given tag name and class name. */ 

function changeclassbgcolor(tagname,classname,colorname) {
 var tochange = getElementsByClassName(tagname,classname);
 for (j=0; j <tochange.length; j++) {
   tochange[j].style.backgroundColor = colorname;
   }
} 


/* change the cursor */

function changecursor(num) {
if (!document.getElementById || ieWin50) {return false; }

else {
var square = "sq" + 1;
document.getElementById(square).style.cursor = 'pointer';}
}


function init() {

showhideclass('p','sublevel','none');
showhideclass('td','pic','none');
if (section > 0) {togglemenu(section);}

}