function cateChildChange(){
	objF = document.getElementById('cate_id');
	objC = document.getElementById('cate_child_id');
	if(objF && objC){
		if(objF.value != ''){
			objC.disabled = false;
			getCateChild(objF.value);
		} else {
			objC.disabled = true;
		}
	}
}

function getCateChild(cateId){
	var Url = "/inc/ajax_cate.php?t=" + (new Date).getTime() + "&cate_id=" + cateId;	
	creatXMLHttpRequest();
	xmlHttp.open("GET",Url,"true");
	xmlHttp.onreadystatechange = function(){
		if(xmlHttp.readyState == 4 && xmlHttp.status == 200){
			clearModelsList();
			var results = xmlHttp.responseXML.getElementsByTagName("cate");
			var obj = document.getElementById("cate_child_id");
			var option = null;

			option = document.createElement("option");
			obj.options.add(option);
			option.text = '選択してください';
			option.value = '';

			for(var i = 0; i < results.length; ++i) {
				option = document.createElement("option");
				obj.options.add(option);
				option.text = results[i].getAttribute('name');
				option.value = results[i].getAttribute('id');
			}
		}		
	}
	xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");
	xmlHttp.send(null);
}

function clearModelsList() {
    var models = document.getElementById("cate_child_id");
    while(models.childNodes.length > 0) {
        models.removeChild(models.childNodes[0]);
    }
}