/*
 * Funciones Utiles para tener a mano
 */

function addEvent( obj, type, fn ) {
	if (obj.addEventListener)
		obj.addEventListener( type, fn, false );
	else if (obj.attachEvent)
	{
		obj["e"+type+fn] = fn;
		obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
		obj.attachEvent( "on"+type, obj[type+fn] );
	}
}
function removeEvent( obj, type, fn ) {
	if (obj.removeEventListener)
		obj.removeEventListener( type, fn, false );
	else if (obj.detachEvent)
	{
		obj.detachEvent( "on"+type, obj[type+fn] );
		obj[type+fn] = null;
		obj["e"+type+fn] = null;
	}
}
function getElementsByClassName(classname) {
    var a = [];
    var re = new RegExp('\\b' + classname + '\\b');
    var els = document.all?document.all:document.getElementsByTagName("*");
    for(var i=0,j=els.length; i < j; i++)
        if(re.test(els[i].className))a.push(els[i]);
    return a;
}
function findPosX(obj) {
	var curleft = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}
	else if (obj.x)
		curleft += obj.x;
	return curleft;
}
function findPosY(obj) {
	var curtop = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}
	else if (obj.y)
		curtop += obj.y;
	return curtop;
}
function getWidth(element) {  //Taken from Prototype library
    if (element.style.display != 'none')
      return element.offsetWidth;

    // All *Width and *Height properties give 0 on elements with display none,
    // so enable the element temporarily
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = '';
    var originalWidth = element.clientWidth;
    els.display = 'none';
    els.position = originalPosition;
    els.visibility = originalVisibility;
    return originalWidth;
}
function getHeight(element) {  //Taken from Prototype library
    if (element.style.display != 'none')
      return element.offsetHeight;

    // All *Width and *Height properties give 0 on elements with display none,
    // so enable the element temporarily
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = '';
    var originalHeight = element.clientHeight;
    els.display = 'none';
    els.position = originalPosition;
    els.visibility = originalVisibility;
    return originalHeight;
}
function addLoadListener(fn) {
 if (window.addEventListener)
 {
   window.addEventListener('load', fn, false);
 }
 else if (document.addEventListener)
 {
   document.addEventListener('load', fn, false);
 }
 else if (window.attachEvent)
 {
   window.attachEvent('onload', fn);
 }
 else
 {
   var oldfn = window.onload;
   if (typeof window.onload != 'function')
   {
     window.onload = fn;
   }
   else
   {
     window.onload = function()
     {
       oldfn();
       fn();
     };
   }
 }
}