function  mm()
{   
	var n = Math.ceil(Math.random()*2);   
	document.getElementById("header").style.background = "url(images/bg"+   n   +".jpg) no-repeat";
}   

function  mmeng()
{   
	var n = Math.ceil(Math.random()*2);   
	document.getElementById("header").style.background = "url(images/bgu"+   n   +".jpg) no-repeat";
}   
function banner_check_date(date1,date2){

		return true;

}
function checkData()
{
	var userName = document.getElementById("userName").value;
	var phone = document.getElementById("phone").value;
	var depDate = document.getElementById("depDate").value;
	var arrDate = document.getElementById("arrDate").value;
	if(trim(userName).length==0) {
		alert("姓名不能为空或空格，请修改！");
		document.getElementById("userName").focus(); 
		return false;
	} else if(trim(phone).length==0) {
		alert("电话不能为空或空格，请修改！");
		document.getElementById("phone").focus();
		return false;
	} else if(trim(depDate).length!=0 && trim(arrDate).length!=0 && !banner_check_date(depDate, arrDate)) {
		alert("回程日期应晚于出发日期，请修改！");
		document.getElementById("arrDate").focus(); 
		return false;
	} else{
		var submitbtn=document.getElementById("submitbtn");
		
		var pattern=/submit.gif/;
		if(pattern.test(submitbtn.src)){
			submitbtn.disabled=1;
			
			alert("正在发送邮件，请耐心等候回电，谢谢！");
		}
		var pattern=/submit_e.gif/;
		if(pattern.test(submitbtn.src)){
			submitbtn.disabled=1;
			
			alert("Sending Email...,Will Contact you later");
		}
		return true;
	}
}

function trim(s) {
	return s.replace( /^\s*/, "" ).replace( /\s*$/, "" );
}