var xmlHttp;
function change(){
	if(xmlHttp.readyState==4&&xmlHttp.status==200){
		var opts = document.getElementById("city");
		for(var j=opts.length-1;j>=0;j--){
			opts.remove(j);
		}
		str=xmlHttp.responseText;
		strs=str.split("|||");
		for(var i=0;i<strs.length;i++){
			s=strs[i].split("@@@");
			el = document.createElement("option");
			el.value=s[0];
			el.text=s[1];
			opts.add(el);
		}
	}
}
function favorites(){
	if(xmlHttp.readyState==4&&xmlHttp.status==200){
		var str=xmlHttp.responseText;
		if(str == 'nologin'){
			if(confirm('您还没有登陆，请先登陆')){window.location='../index.php';}
		}else{
			alert(str);
		}
	}
}
function createXMLHttpRequest(){
	if(window.ActiveXObject){
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else if(window.XMLHttpRequest){
		xmlHttp = new XMLHttpRequest();
	}
}
function region(url,obj){
	createXMLHttpRequest();
	var nowtime	= new Date().getTime();
	url	+= (url.indexOf("?") >= 0) ? "&nowtime=" + nowtime : "?nowtime=" + nowtime;
	xmlHttp.onreadystatechange = obj;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}
function chkcart(){
	var frm=document.myform;
	var paymentSelected = false;
	var shippingSelected = false;
	for (i = 0; i < frm.elements.length; i ++ ){
		if (frm.elements[i].name == 'shipr' && frm.elements[i].checked){
		  shippingSelected = true;
		}
		if (frm.elements[i].name == 'paymentr' && frm.elements[i].checked){
		  paymentSelected = true;
		}
	}
	if(!shippingSelected){
		alert('请选择配送方式！');
		return false;
	}
	if(!paymentSelected){
		alert('请选择支付方式！');
		return false;
	}
}