var v = new Array(); 
	var vs = "10X98765432"; 
	var newCardID = ""; 
	function checkCardID(cardID15) 
	{ 
		v.push(2, 4, 8, 5, 10, 9, 7, 3, 6, 1, 2, 4, 8, 5, 10, 9, 7); 
		//var cardID = cardID15.value; 
		var cardID = cardID15;
		if(cardID.length!=15) 
		{ 
			alert("请输入15位你的身份证号码！"); 
			cardID15.focus(); 
			return; 
		} 
		var month = cardID.substring(8,10);//获得15位号码中的月份 
		if(!checkMonth(month)) 
		{ 
			alert("你输入的身份证格式不正确，月份填写错误！") 
			cardID15.focus(); 
			return; 
		} 
		var year = "19" + cardID.substring(6,8); 
		var day = cardID.substring(10,12); 
		if(!checkDay(year,month,day)) 
		{ 
			alert("你输入的身份证的个格式不正确，日期格填写错误"); 
			cardID15.focus(); 
			return; 
		} 
		//alert(checkDay(year,month,day)); 
		//将15位的号码转换位17位 
		var cardID17 = cardID.substring(0,6)+"19"+cardID.substring(6); 
		var N = 0; 
		var R = -1; 
		var T = '0';//储存最后一个数字 
		var j = 0; 
		var cardID18=""; 
		//计数出第18位数字 
		for (var i = 16; i >= 0; i--) 
		{ 
			N += parseInt(cardID17.substring(i, i + 1)) * v[j]; 
			j++; 
		}
		R = N % 11; 
		T = vs.charAt(R); 
		cardID18 = cardID17 + T; 
		//document.getElementById("cardID18").value=cardID18; 
		newCardID = cardID18; 
		return newCardID;
	} 
	//判断输入的月份是否正确 
	function checkMonth(month) 
	{ 
		if(month<1||month>12) 
		{
			return false; 
		}
		return true; 
	}
	/** 
	**检查你输入的天数是否正确 
	**yean为年 
	**month为月 
	**day为日 
	**/ 
	
	function checkDay(year,month,day) 
	{ 
		var Mday = 0; 
		if(day<1||day>31) 
		{ 
			return false; 
		} 
		if(month==1||month==3||month==5||month==7||month==8||month==10||month==12) 
		{ 
			Mday = 31; 
		} 
		if(month==4||month==6||month==9||month==11) 
		{ 
			Mday = 30; 
		} 
		if(month==2) 
		{ 
			Mday = isLeapYear(year); 
		}
		if(day>Mday) 
		{ 
			return false; 
		}
		return true; 
	}
	//判断你输入的年是否位闰年 
	function isLeapYear(year) 
	{ 
		return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0) ? 29 : 28; 
	}
	function checkNewCardID() 
	{ 
		alert("18位身份证号码为："+newCardID); 
	}