function $(id){return document.getElementById(id);}
// 全局标签切换效果
//用法：切换内容用连接表示，写在id名为menu+"i"的元素里面，切换内容写在id名为main+"i"的元素里面；激活状态的样式名为"menu_on"，非激活状态下的样式名为"menu_off"
function setTab(m,n){
var tli = $("menu"+m).getElementsByTagName("a");
var mli = $("main"+m).getElementsByTagName("ul");
	for(i=0;i<tli.length;i++){
		tli[i].className = i==n?"menu_on":"menu_off";
		mli[i].style.display = i==n?"block":"none";
	}
}

//表单切换效果，用法同上
function setform(m,n){
var tli = $("type"+m).getElementsByTagName("input");
var mli = $("form"+m).getElementsByTagName("span");
	for(i=0;i<tli.length;i++){
		tli[i].className = i==n?"form_on":"form_off";
		mli[i].style.display = i==n?"block":"none";
	}
}
//机票搜索内容 显示/隐藏 切换效果
function setticket(m){
var obj = $("detail"+m);
	if (obj)
		obj.style.display=='none'?obj.style.display='':obj.style.display='none';
}

function writeDate(aWithDay) {
var today = new Date();
var d = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六");
var html;

	html = today.getFullYear() + "年" + (today.getMonth() + 1) + "月" + today.getDate() + "日";
	if (aWithDay != null) {
		html = html + d[today.getDay()];
	}
	document.write(html);
}

function toNumeric(aNum) {
var result = aNum * 1;
	if (!(result>=0))
		result = 0;
	return result;
}

function ShowDivCity() {
    $("DivCity").style.display= "block";
}

function HiddenDivCity() {
    $("DivCity").style.display = "none";
}