// Title: helper.js
//	JavaScript helper functions for VHC website



// Function: collapseAll
//	Collapses all sub-menus except one
// Parameters:
//	el - The element to leave alone
function collapseAll(el) {
	var elms = document.getElementsByClassName("sub_menu");

	for (var i = 0; i < elms.length ; i ++ )
		if (elms[i].style.display != 'none')
			new Effect.SlideUp(elms[i], {duration: 0.3});
}


// Function: toggleSlide
//	Toggles the visibility of an element by sliding it in and out of visibility
// Parameters:
//	el - The element to toggle
function toggleSlide(el) {
	var _duration = 0.5;	

	if ($(el).style.display=='none')
	{
		collapseAll($(el));
		new Effect.SlideDown($(el), {duration:_duration});
	} else {
		collapseAll($(el));
		new Effect.SlideUp($(el), {duration:_duration});
	}
}


// Function: make_events_508_compliant
//	Loops through all elements in document, checking for mouse specific event handlers. Upon finding one, it copies the mouse event handler
// to its keyboard equivelant.
function make_events_508_compliant() {
	var _all = document.getElementsByTagName("*");
	var i;
	var tmp;

	for(i = 0; i < _all.length; i++) {
		tmp = _all[i];

		if (tmp.onclick)
			tmp.onkeypress = tmp.onclick;
		if (tmp.onmouseup)
			tmp.onkeyup    = tmp.onmouseup;
		if (tmp.onmousedown)
			tmp.onkeydown  = tmp.onmousedown;
		if (tmp.onmouseover)
			tmp.onfocus    = tmp.onmouseover;
		if (tmp.onmouseout)
			tmp.onblur     = tmp.onmouseout;
	}
}


// Function: page_init
//	Preliminary routines for page load
function page_init() {
	make_events_508_compliant();
}


// Function: make_seperators_linkable
//	Iterates through DOM, searching for elements with class "returnToTop"
//	and gives those elements an onclick event handler to return to the "#top" anchor.
function make_seperators_linkable() {
	var seps = document.getElementsByClassName("returnToTop");

	for (var i = 0; i < seps.length ; i++ )
		seps[i].onclick = function() { location='#top'; };
}


// Function: subpage_init
//	Calls functions necessary for sub-pages to operator properly
function subpage_init() {
	make_seperators_linkable();  // see function comments
	make_events_508_compliant(); //


	// make sidebar same height as main content area:
	// (hack for FireFox)
	// $('sidebar').setAttribute("style","height: "+$('columnRight').offsetHeight+"px;")	
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}