var xmlParser = {
	xmlDoc: false,
	parse: function(xmldoc){
		this.xmlDoc = xmldoc;
		alert('Hola');
		return this;
	},
	
	diHola: function(){
		if(!this.xmlDoc) throw("XML not loaded.\n Call xmlParser.parse(xmlDoc) first");
		alert(this.xmlDoc);
	}
}