/**
 * 判断浏览器类型
 */
var userAgent = navigator.userAgent.toLowerCase();
var is_opera = userAgent.indexOf('opera') != -1 && opera.version();
var is_moz = (navigator.product == 'Gecko') && userAgent.substr(userAgent.indexOf('firefox') + 8, 1);					//火狐
var is_ie = (userAgent.indexOf('msie') != -1 && !is_opera) && userAgent.substr(userAgent.indexOf('msie') + 5, 1);		//IE


/**
 * 获取对应id的元素
 * @param string id
 * @return object
*/
var $ = function (id) {
	if(document.getElementById) {
		return 	document.getElementById(id);
	} else {
		return document.all.id;	
	}
}

function setCity(cityid,province) {	
	setSelectOption(cityid, arrCity[province], '');
}
function removeOptions(selectObj){
	if (typeof selectObj != 'object'){
		selectObj = $(selectObj);
	}
	var len = selectObj.options.length;

	for (var i=0; i < len; i++){

		selectObj.options[0] = null;
	}
}
function setSelectOption(selectObj, optionList, firstOption, selected){
	if (typeof selectObj != 'object'){
		selectObj = $(selectObj);
	}
	removeOptions(selectObj);
	var start = 0;
	if (firstOption){
		selectObj.options[0] = new Option(firstOption, '');
		start ++;
	}
	var len = optionList.length;
	for (var i=0; i < len; i++){
		selectObj.options[start] = new Option(optionList[i].txt, optionList[i].val);
		if(selected == optionList[i].val){
			selectObj.options[start].selected = true;
		}
		start ++;
	}
}