function checkLength(obj,length)
{
	obj.value = trim(obj.value);
	var l=0;
	l = obj.value.length;
	if(l>length)
	{
		alert("该字段仅能输入"+length+"个字符，多出部分已截除！");
		obj.value = obj.value.substring(0,length);
	}
}

function formatDate(dateStr)
{
	var returnDate = "";
	if(dateStr!=""){
		var yIndex = dateStr.indexOf("年");
		var mIndex = dateStr.indexOf("月");
		var dIndex = dateStr.indexOf("日");
		if(yIndex!=-1 && mIndex!=-1 && dIndex!=-1){
			returnDate =  dateStr.substring(0,yIndex)+"-"+dateStr.substring(yIndex+1,mIndex)+"-"+dateStr.substring(mIndex+1,dIndex);
		}else{
			returnDate =  dateStr.substring(0,4)+"-"+dateStr.substring(5,7)+"-"+dateStr.substring(8,10);
		}
	}
	return returnDate;
}