var W3CDOM = (document.createElement && document.getElementsByTagName);

document.getElementsByClassName = function(className, container){
   var data = tags = [];
   var obj = document.getElementById("contenedor");
   var node = aux = null;
	var strClassName = className.replace(/\-/g, "\\-");
    var pattern = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
	if(container) node = (typeof(container) == "object") ? container : document.getElementById(container);
	else node = (obj) ? obj : document;
	aux = node.getElementsByTagName("*");
	tags = (document.all) ? node.all : aux;
   for(var i=0;i<tags.length;i++) { if(pattern.test(tags[i].className)) data.push(tags[i]);}
   return data;
}


var e = {
	addEvent : function(obj, evType, fn, useCapture){
		if (obj.addEventListener){
			obj.addEventListener(evType, fn, useCapture);
			return true;
		}else if (obj.attachEvent){
			var r = obj.attachEvent("on"+evType, fn);
			return r;
		}else {
			return false;
		}
	}
}

var load={
	existeId:function(cid){	
		if(document.getElementById(cid)) return true;		
		return false;
	},
	setEvents:function(){				
		if(load.existeId("calendar")) calendario.init();
	}
}

if(W3CDOM) e.addEvent(window, "load", load.setEvents, false);