// javascript utility functions
var n = false;
var ie = false;
var w3c = false;
var show = 'visible';
var hide = 'hidden';

if (document.layers) { // netscape4-esque
	n = true;
	show = 'show';
	hide = 'hide';
} else if (document.getElementById) { // w3c-compliant-esque
	w3c = true;
} else if (document.all) { // ie4-5-esque
	ie = true;
}

function getElementStyle(name) {
	if (n) {
		for (var i = 0; i < document.layers.length; i++) {
			if (document.layers[i].name == name)
				return document.layers[i];
		}
	}
	else if (ie) {
		if (document.all[name] == null) return null;
		if ( (document.all[name].style.position != 'absolute') && (document.all[name].style.position != 'relative') ) {
			for (var s = 0; s < document.styleSheets.length; s++) {
				for (var r = 0; r < document.styleSheets[s].rules.length; r++) {
					currentItem = document.styleSheets[s].rules[r].selectorText;
					if ( (currentItem == '#' + name) || (currentItem == '.' + name) )
						return document.styleSheets[s].rules[r].style;
				}
			}
		} else
			return document.all[name].style;
	}
	else if (w3c) {
		if (document.getElementById((name)) != null)
			return document.getElementById((name)).style;
	}

	return null;
}

function showHideItem(itemToShow, showItem) {
 	theObj = getElementStyle(itemToShow);
	if (theObj != null) theObj.visibility = (showItem) ? show : hide;
}

function HideLayers() {
	for (l = 0; l < (arguments.length); l++)
		showHideItem(arguments[l], false);
}
function ShowLayers() {
	for (l = 0; l < (arguments.length); l++)
		showHideItem(arguments[l], true);
}

var loaded = new Array();
function F_loadRollover(image,imageName) {
   if (image && image.src &&
    (null == image.out || typeof(image.out) == typeof(void(0)))) {
      s = image.src;
      image.out = new Image();
      image.out.src = s;
      image.over = new Image();
      if (imageName.lastIndexOf('/') >= 0 || imageName.lastIndexOf('\\') >=0) {
         s = imageName;
      } else {
         i = s.lastIndexOf('/');
         if (i<0) i = s.lastIndexOf('\\');
         if (i<0) { s = imageName; }
         else     { s = s.substring(0,i+1) + imageName; }
      }
      image.over.src = s;
      loaded[image.name] = image;
   }
}

function F_roll(imageName,over) {
   if (document.images) {
      if (over) { imageObject = "over"; }
      else      { imageObject = "out"; }
   image = loaded[imageName];
   if (image) {
       ref = eval("image."+imageObject);
       if (ref) image.src = eval("image."+imageObject+".src");
   }
   if (window.event)
      window.event.cancelBubble = true;
   }
}

function changeImage(imgNam,status) {
	if (document.images) {
		document[imgNam].src = eval(imgNam + '_' + status + '.src');
	}
}

function ChangeBackground(item, color) {
	obj = getElementStyle(item);
	obj.backgroundColor = color;
}

function HideBackground(item) {
	ChangeBackground(item, 'transparent');
}

function gotoPage(value, page) {
	if (value != 'x')
		top.location.href=page + '.php?id=' + value;
}

function gotoArticle(select) {
	gotoPage(select.value, 'article');
}

function gotoEvent(select) {
	gotoPage(select.value, 'events');
}

function windowOpen(url, width, height) {
	window.open(url, 'gallery', "width=" + width + ",height=" + height + ",menubar=no,toolbar=no,status=no,location=no");
}

function NewWindow(mypage, myname, w, h, scroll) {

	winprops = 'height=' + h + ',width=' + w + ',scrollbars=' + scroll;

	win = window.open(mypage, myname, winprops);
	if (window.focus)
		win.focus();

	return false;
}