var obj;
var field_0;
var field_1;
var field_loading;
var lang;

function fillSelectRelatedArticle(host, obj, fk_value, form, lang) {
	this.obj = obj;
	this.field_0 = form.article_type_id;
	this.field_1 = form.category;
    this.lang = lang;

	resetSelectRelatedArticle(obj);

	// check if object exisits.
	if (typeof obj != 'object') return false;

	if (fk_value > 0) {
		form.category.disabled=true;
	}

	//if (obj.name == "category") {
		//resetSelectRelatedArticle(form.region_id);
		
		if (fk_value > 0) {
			form.category.options[1] = new Option("Loading...", -1);
			form.category.options[1].selected=true;
			this.field_loading = form.category;
		}
		url = host + '/related_article.php?article_type_id=' + fk_value + '&lang=' + lang;
		if (fk_value > 0) loadResultRelatedArticle(url, '');
	//}

}

function resetSelectRelatedArticle(obj) {
	while (obj.options.length>1) {
		deleteIndex=obj.options.length-1;
		obj.options[deleteIndex]=null;
	}
}

function loadXMLDocRelatedArticle(url) {
	// branch for native XMLHttpRequest object
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
		req.onreadystatechange = processReqChangeRelatedArticle;
		req.open("GET", url, true);
		req.send(null);
	// branch for IE/Windows ActiveX version
	} else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req) {
			req.onreadystatechange = processReqChangeRelatedArticle;
			req.open("GET", url, true);
			req.send();
		}
	}
}

function processReqChangeRelatedArticle() {
	// only if req shows "complete"
	if (req.readyState == 4) {
		// only if "OK"
		if (req.status == 200) {
			// ...processing statements go here
			response  = req.responseXML.documentElement;
			if (response) {
				var result = new Array();
				for (i=0; i < response.getElementsByTagName('id').length; i++) {
					result[i] = {'id': response.getElementsByTagName('id')[i].firstChild.data, 'title': response.getElementsByTagName('title')[i].firstChild.data, 'obj_name': response.getElementsByTagName('obj_name')[i].firstChild.data};
				}
				loadResultRelatedArticle('',result);
				unlockLocationRelatedArticle();
			}
		} else {
			alert("There was a problem retrieving the XML data:\n" + req.statusText);
		}
	}
}

function loadResultRelatedArticle(url, result) {
	
	if (result != '') {
		// Response mode
		for (i=0; i < result.length; i++) {
			
			document.getElementById(result[i].obj_name).options[document.getElementById(result[i].obj_name).options.length] = new Option(result[i].title,result[i].id);
		}
	} else if (url != '') {
		// Input mode
		return (loadXMLDocRelatedArticle(url));
	}
}

function unlockLocationRelatedArticle() {
	if (this.field_loading) {
		this.field_loading.options[1]=null;
		this.field_loading.options[0].selected=true;
	}
	this.field_0.disabled=false;
	this.field_1.disabled=false;
}