var obj;
var field_0;
var field_1;
var field_2;
var field_loading;

function fillCategorySelect(host, obj, fk_value, form, type){
			
	this.obj = obj;	
	if(form.category_id)
		this.field_0 = form.category_id;
	if(form.subcategory_id)
		this.field_1 = form.subcategory_id;
	if(form.subsubcategory_id)
		this.field_2 = form.subsubcategory_id;
	
	// check if object exisits.
	if(typeof obj != 'object') return false;
	
	if (fk_value > 0 && obj.name == "subcategory_id") {
		if(form.category_id)
			form.category_id.disabled=true;
		if(form.subcategory_id)
			form.subcategory_id.disabled=true;
		if(form.subsubcategory_id)
			form.subsubcategory_id.disabled=true;

	}

	if(obj.name == "subcategory_id"){
		resetSelect(form.subcategory_id);
		if (fk_value > 0) {
			obj.options[1] = new Option("Loading...", -1);
			obj.options[1].selected=true;
			this.field_loading = obj;
		}
		url  = host+'categories.php?category_id=' + fk_value + '&type=' + type;
		if(fk_value > 0) loadResult(url,'');
	}

	if(obj.name == "subsubcategory_id"){
		resetSelect(form.subsubcategory_id);
		form.subcategory_id.disabled=true;
		form.subsubcategory_id.disabled=true;
		if (fk_value > 0) {
			obj.options[1] = new Option("Loading...", -1);
			obj.options[1].selected=true;
			this.field_loading = obj;
		}
		url  = host+'categories.php?category_id=' + fk_value + '&type=' + type;
		if(fk_value > 0) loadResult(url,'');
	}

}

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

function loadXMLDoc(url) {
	// branch for native XMLHttpRequest object
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
		req.onreadystatechange = processReqChange;
		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 = processReqChange;
			req.open("GET", url, true);
			req.send();
		}
	}
}

function processReqChange() {
	// 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, 'name': response.getElementsByTagName('name')[i].firstChild.data};
				}
				loadResult('',result);
				unlockLocation();
			}
		} else {
			alert("There was a problem retrieving the XML data:\n" + req.statusText);
		}
	}
}

function loadResult(url, result){
	if (result != ''){
		// Response mode
		this.obj.options.length=this.obj.options.length-1;
		this.obj.options[this.obj.options.length]= new Option("Select a SubSubCategory", '');
		
		for(i=0; i < result.length; i++){
			this.obj.options[this.obj.options.length]  = new Option(result[i].name,result[i].id);
		}
	} else if(url != '') {
		// Input mode
		return (loadXMLDoc(url));
	} else{
		this.obj.options.length=this.obj.options.length-1;
		this.obj.options[this.obj.options.length]= new Option("Subcategories not found", '');
	}
}

function unlockLocation() {
	
	if (this.field_loading) {
		this.field_loading.options[1]=null;
		this.field_loading.options[0].selected=true;
	}
	
	if ((this.field_loading.name=='subcategory_id') && (this.field_2)) {
		if(this.field_2){
			this.field_2.options[1]=null;
			this.field_2.options[0].selected=true;
			this.field_2.options.length=0;
		}
	}
	
	if(this.field_0)
		this.field_0.disabled=false;
	if(this.field_1)
		this.field_1.disabled=false;
	if(this.field_2)
		this.field_2.disabled=false;
	showSelect();
}

function showSelect(){
	
	if(this.field_1.options.length > 1){
		
		if(document.getElementById('SubCategory_Search'))
			document.getElementById('SubCategory_Search').style.display="block";
		if(this.field_2){
			if(this.field_2.options.length > 1){
				if(document.getElementById('SubSubCategory_Search'))
					document.getElementById('SubSubCategory_Search').style.display="block";
			}else{
				if(document.getElementById('SubSubCategory_Search'))
					document.getElementById('SubSubCategory_Search').style.display="none";
			}
		}
	}else{
		if(document.getElementById('SubCategory_Search'))
			document.getElementById('SubCategory_Search').style.display="none";
	}
	
}