function showhide(_tob)
{
    if(_tob.value==1)$('mytb').style.display='none';
    if(_tob.value==2)$('mytb').style.display='block';
}

function frmCheck()
{

    if ($("txtDCity").value==''||$("txtDCity").value=='中文/拼音')
    {
	    alert("出发城市不能为空！");
	    $("txtDCity").focus();
	    return false;
    }
   

    if ($("txtdest_city").value==''||$("txtdest_city").value=='中文/拼音')
    {
	    alert("目的城市不能为空！");
	    $("txtdest_city").focus();
	    return false;
    }

    if ($("txtDDatePeriod").value==''||$("txtDDatePeriod").value=='yyyy-mm-dd')
    {
	    alert("出发日期不能为空！");
	    $("txtDDatePeriod").focus();
	    return false;
    }

    if ($("mytb").style.display=="block")
    {
	
	    if ($("txtADatePeriod").value==''||$("txtADatePeriod").value=='yyyy-mm-dd')
	    {
		    alert("返程日期不能为空！");
		    $("txtADatePeriod").focus();
		    return false;
	    }

	    d1 = $("txtDDatePeriod").value;
	    d2 = $("txtADatePeriod").value;
	    if (compareDate(d1,d2))
	    {
		    alert("返程日期必须晚于出发日期！");
		    return false;
	    }
    }
    $("button").disabled=true;
 
   document.getElementById("domestic_searching").submit();
	
}
function compareDate(DateOne,DateTwo)
{ 
    var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ("-"));
    var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ("-")+1);
    var OneYear = DateOne.substring(0,DateOne.indexOf ("-"));

    var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf ("-"));
    var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf ("-")+1);
    var TwoYear = DateTwo.substring(0,DateTwo.indexOf ("-"));
    if (Date.parse(OneMonth+"/"+OneDay+"/"+OneYear) >
    Date.parse(TwoMonth+"/"+TwoDay+"/"+TwoYear))
    {
        return true;
    }
    else
    {
        return false;
    }
}