// IE doesn't support const?
var BASE64_VALUES = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

function preloadImage(src)
{  
  var img = new Image;
  img.src = src;
}

function setImage(id, src)
{
  var img = document.getElementById(id);
  img.src = src;
}

function base64Decode(s)
{
  s = s.replace(/[^A-Za-z0-9\+\/\=]/g, '');
  
  var result = new Array();  
  var i = 0;
  var j = 0;        
  
  do 
  {      
    var enc1 = BASE64_VALUES.indexOf(s.charAt(i++));
    var enc2 = BASE64_VALUES.indexOf(s.charAt(i++));
    var enc3 = BASE64_VALUES.indexOf(s.charAt(i++));
    var enc4 = BASE64_VALUES.indexOf(s.charAt(i++));    
    
    var b1 = (enc1 << 2) | (enc2 >> 4);
    var b2 = ((enc2 & 15) << 4) | (enc3 >> 2);
    var b3 = ((enc3 & 3) << 6) | enc4;
    
    result[j++] = b1; 
    
    if (enc3 != 64) 
    {
      result[j++] = b2;
    }
    if (enc4 != 64) 
    {
      result[j++] = b3;
    }
        
  } while (i < s.length);
    
  return result;
}

function base64DecodeStr(s)
{
  bytes = base64Decode(s);
  
  var i = 0;
  var result = '';
  
  while (i < bytes.length - 1)
  {
    var c = (bytes[i++] << 8) | (bytes[i++] & 255);    
    result += String.fromCharCode(c);
  }
  
  return result;
}

function xmlEncode(s)
{
  s = s.replace(/&/g, '&amp;');
  s = s.replace(/</g, '&lt;');
  s = s.replace(/>/g, '&gt;');
  s = s.replace(/"/g, '&quot;');
  s = s.replace(/'/g, '&#039;');
  
  return s;
}

function emailLink(encoded)
{
  var email = base64DecodeStr(encoded);
  email = xmlEncode(email);
  
  document.write('<a href="mailto:');
  document.write(encodeURIComponent(email));
  document.write('">');
  document.write(email);
  document.write('</a>');
}


/* Following code from http://www.codeproject.com/jscript/jsactb.asp for dropdown */

/* Event Functions */

// Add an event to the obj given
// event_name refers to the event trigger, without the "on", like click or mouseover
// func_name refers to the function callback when event is triggered
function addEvent(obj,event_name,func_name){
	if (obj.attachEvent){
		obj.attachEvent("on"+event_name, func_name);
	}else if(obj.addEventListener){
		obj.addEventListener(event_name,func_name,true);
	}else{
		obj["on"+event_name] = func_name;
	}
}

// Removes an event from the object
function removeEvent(obj,event_name,func_name){
	if (obj.detachEvent){
		obj.detachEvent("on"+event_name,func_name);
	}else if(obj.removeEventListener){
		obj.removeEventListener(event_name,func_name,true);
	}else{
		obj["on"+event_name] = null;
	}
}

// Stop an event from bubbling up the event DOM
function stopEvent(evt){
	evt || window.event;
	if (evt.stopPropagation){
		evt.stopPropagation();
		evt.preventDefault();
	}else if(typeof evt.cancelBubble != "undefined"){
		evt.cancelBubble = true;
		evt.returnValue = false;
	}
	return false;
}

// Get the obj that starts the event
function getElement(evt){
	if (window.event){
		return window.event.srcElement;
	}else{
		return evt.currentTarget;
	}
}
// Get the obj that triggers off the event
function getTargetElement(evt){
	if (window.event){
		return window.event.srcElement;
	}else{
		return evt.target;
	}
}
// For IE only, stops the obj from being selected
function stopSelect(obj){
	if (typeof obj.onselectstart != 'undefined'){
		addEvent(obj,"selectstart",function(){ return false;});
	}
}

/*    Caret Functions     */

// Get the end position of the caret in the object. Note that the obj needs to be in focus first
function getCaretEnd(obj){
	if(typeof obj.selectionEnd != "undefined"){
		return obj.selectionEnd;
	}else if(document.selection&&document.selection.createRange){
		var M=document.selection.createRange();
		var Lp=obj.createTextRange();
		Lp.setEndPoint("EndToEnd",M);
		var rb=Lp.text.length;
		if(rb>obj.value.length){
			return -1;
		}
		return rb;
	}
}
// Get the start position of the caret in the object
function getCaretStart(obj){
	if(typeof obj.selectionStart != "undefined"){
		return obj.selectionStart;
	}else if(document.selection&&document.selection.createRange){
		var M=document.selection.createRange();
		var Lp=obj.createTextRange();
		Lp.setEndPoint("EndToStart",M);
		var rb=Lp.text.length;
		if(rb>obj.value.length){
			return -1;
		}
		return rb;
	}
}
// sets the caret position to l in the object
function setCaret(obj,l){
	obj.focus();  
	if (obj.setSelectionRange){
		obj.setSelectionRange(l,l);
	}else if(obj.createTextRange){
		m = obj.createTextRange();		
		m.moveStart('character',l);
		m.collapse();
		m.select();
	}
}
// sets the caret selection from s to e in the object
function setSelection(obj,s,e){
	obj.focus();
	if (obj.setSelectionRange){
		obj.setSelectionRange(s,e);
	}else if(obj.createTextRange){
		m = obj.createTextRange();		
		m.moveStart('character',s);
		m.moveEnd('character',e);
		m.select();
	}
}

/*    Escape function   */
String.prototype.addslashes = function(){
	return this.replace(/(["\\\.\|\[\]\^\*\+\?\$\(\)])/g, '\\$1');
}
String.prototype.trim = function () {
    return this.replace(/^\s*(\S*(\s+\S+)*)\s*$/, "$1");
};
/* --- Escape --- */

/* Offset position from top of the screen */
function curTop(obj){
	toreturn = 0;
	while(obj){
		toreturn += obj.offsetTop;
		obj = obj.offsetParent;
	}
	return toreturn;
}
function curLeft(obj){
	toreturn = 0;
	while(obj){
		toreturn += obj.offsetLeft;
		obj = obj.offsetParent;
	}
	return toreturn;
}
/* ------ End of Offset function ------- */

/* Types Function */

// is a given input a number?
function isNumber(a) {
    return typeof a == 'number' && isFinite(a);
}

/* Object Functions */

function replaceHTML(obj,text){
	while(el = obj.childNodes[0]){
		obj.removeChild(el);
	};
	obj.appendChild(document.createTextNode(text));
}