/**
 * COMMON DHTML FUNCTIONS
 * These are handy functions I use all the time.
 *
 * By Seth Banks (webmaster at subimage dot com)
 * http://www.subimage.com/
 *
 * Up to date code can be found at http://www.subimage.com/dhtml/
 *
 * This code is free for you to use anywhere, just keep this comment block.
 */

/**
 * X-browser event handler attachment and detachment
 * TH: Switched first true to false per http://www.onlinetools.org/articles/unobtrusivejavascript/chapter4.html
 *
 * @argument obj - the object to attach event to
 * @argument evType - name of the event - DONT ADD "on", pass only "mouseover", etc
 * @argument fn - function to call
 */
function addEvent(obj, evType, fn){
 if (obj.addEventListener){
    obj.addEventListener(evType, fn, false);
    return true;
 } else if (obj.attachEvent){
    var r = obj.attachEvent("on"+evType, fn);
    return r;
 } else {
    return false;
 }
}
function removeEvent(obj, evType, fn, useCapture){
  if (obj.removeEventListener){
    obj.removeEventListener(evType, fn, useCapture);
    return true;
  } else if (obj.detachEvent){
    var r = obj.detachEvent("on"+evType, fn);
    return r;
  } else {
    alert("Handler could not be removed");
  }
}


function findPos(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	return [curleft,curtop];
}

/**
 * Code below taken from - http://www.evolt.org/article/document_body_doctype_switching_and_more/17/30655/
 *
 * Modified 4/22/04 to work with Opera/Moz (by webmaster at subimage dot com)
 *
 * Gets the full width/height because it's different for most browsers.
 */
function getViewportHeight() {
	if (window.innerHeight!=window.undefined) return window.innerHeight;
	if (document.compatMode=='CSS1Compat') return document.documentElement.clientHeight;
	if (document.body) return document.body.clientHeight; 
	return window.undefined; 
}
function getViewportWidth() {
	if (window.innerWidth!=window.undefined) return window.innerWidth; 
	if (document.compatMode=='CSS1Compat') return document.documentElement.clientWidth; 
	if (document.body) return document.body.clientWidth; 
	return window.undefined; 
}

//Decodes Base64 formated data
function bd(data){
	data = data.replace(/[^a-z0-9\+\/=]/ig, '');// strip none base64 characters
	if (typeof(atob) == 'function') return atob(data);//use internal base64 functions if available (gecko only)
	var b64_map = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
	var byte1, byte2, byte3;
	var ch1, ch2, ch3, ch4;
	var result = new Array();
	var j=0;
	while ((data.length%4) != 0) {
		data += '=';
	}
	
	for (var i=0; i<data.length; i+=4) {
		ch1 = b64_map.indexOf(data.charAt(i));
		ch2 = b64_map.indexOf(data.charAt(i+1));
		ch3 = b64_map.indexOf(data.charAt(i+2));
		ch4 = b64_map.indexOf(data.charAt(i+3));

		byte1 = (ch1 << 2) | (ch2 >> 4);
		byte2 = ((ch2 & 15) << 4) | (ch3 >> 2);
		byte3 = ((ch3 & 3) << 6) | ch4;

		result[j++] = String.fromCharCode(byte1);
		if (ch3 != 64) result[j++] = String.fromCharCode(byte2);
		if (ch4 != 64) result[j++] = String.fromCharCode(byte3);	
	}

	return result.join('');
}