var containerElement = null;
var visibleId = null;

function swapVisibility(id) {
	if (visibleId != null && visibleId != id) {
		containerElement.style.display = 'none';
		containerElement.style.visibility = 'hidden';
		containerElement = null;
	}
	containerElement = document.getElementById(id);
	if (containerElement.style.display == 'none') {
		containerElement.style.display = 'block';
		containerElement.style.visibility = 'visible';
		visibleId = id;
	} else {
		containerElement.style.display = 'none';
		containerElement.style.visibility = 'hidden';
		containerElement = null;
		visibleId = null;
	}
	return false;
}

/* general variables */

var fadeTargetId = 'galerix_container';
var	fadeTarget;
var preInitTimer;
preInit();

/* functions */

function preInit() {
	if ((document.getElementById)&&(fadeTarget=document.getElementById(fadeTargetId))) {
		fadeTarget.style.visibility = "hidden";
		if (typeof preInitTimer != 'undefined') clearTimeout(preInitTimer);
	} else {
		preInitTimer = setTimeout("preInit()",2);
	}
}

function fadeInit() {
	if (document.getElementById) {
		preInit();
		if (fadeTarget.style.MozOpacity!=null) {  
			/* Mozilla's pre-CSS3 proprietary rule */
			fadeTarget.style.MozOpacity = 0;
		} else if (fadeTarget.style.opacity!=null) {
			/* CSS3 compatible */
			fadeTarget.style.opacity = 0;
		} else if (fadeTarget.style.filter!=null) {
			/* IE's proprietary filter */
			fadeTarget.style.filter = "alpha(opacity=0)";
		}
		/* make the object visible again */
		fadeTarget.style.visibility = 'visible';
		window.setTimeout("fadeIn(0)", 500);
	}
}

function fadeIn(opacity) {
	if (fadeTarget) {
		if (opacity <= 100) {
			if (fadeTarget.style.MozOpacity!=null) {
				/* Mozilla's pre-CSS3 proprietary rule */
				fadeTarget.style.MozOpacity = (opacity/100)-.001;
				/* the .001 fixes a glitch in the opacity calculation which normally results in a flash when reaching 1 */
			} else if (fadeTarget.style.opacity!=null) {
				/* CSS3 compatible */
				fadeTarget.style.opacity = (opacity/100)-.001;
			} else if (fadeTarget.style.filter!=null) {
				/* IE's proprietary filter */
				fadeTarget.style.filter = "alpha(opacity="+opacity+")";
				/* worth noting: IE's opacity needs values in a range of 0-100, not 0.0 - 1.0 */ 
			}
			opacity += 10;
			window.setTimeout("fadeIn("+opacity+")", 30);
		}
	}
}

/* initialise fader by hiding image object first */
addEvent(window,'load',fadeInit)

/* 3rd party helper functions */

/* addEvent handler for IE and other browsers */
function addEvent(elm, evType, fn, useCapture) 
// addEvent and removeEvent
// cross-browser event handling for IE5+,  NS6 and Mozilla
// By Scott Andrew
{
 if (elm.addEventListener){
   elm.addEventListener(evType, fn, useCapture);
   return true;
 } else if (elm.attachEvent){
   var r = elm.attachEvent("on"+evType, fn);
   return r;
 }
}