function check_time()
{
	var date_arr = document.getElementById('stime').value.split("-");
	var year=parseInt(date_arr[0],10);
	var month=parseInt(date_arr[1],10);
	var day=parseInt(date_arr[2],10);
	var date1=new Date(year,month,day);
	date1 = date1.getTime();

	date_arr = document.getElementById('etime').value.split("-");
	year=parseInt(date_arr[0],10);
	month=parseInt(date_arr[1],10);
	day=parseInt(date_arr[2],10);
	var date2=new Date(year,month,day);
	date2 = date2.getTime();
	
	if(date1>date2)
	{
		alert("请注意”开始时间“不得晚于”结束时间“！");
		return false;
	}
}