//---表单提交----

$("#destiation_form").submit(function(){

var from_city_value=$("#from_city").val();

if(from_city_value.indexOf('MFM')>0){

$("#to_city").attr("value","");

}

var to_city_value=$("#to_city").val();

if(from_city_value==''){

//显示提示错误信息

return false;

}else if(to_city_value==''){

//显示提示错误信息

return false;

}else{

return true;

}

});