function test()
	{
		if(document.form1.key.value=="")
		{
			alert("抱歉！输入不能为空！请您输入！");
			txt=false;
			document.form1.key.focus();
			return txt;
		}

	var str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ,./'[]{}`1234567890-=\~!@#$%^&*()_+|?><:";
	var errorChar
	errorChar = isCharsInBag(form1.key.value,str)
	if (errorChar != "" )
	{
		alert('输入必须是中文！');
	form1.key.focus();
		return false;
	} 
	}

	function isCharsInBag (s, bag)
{ 
var i,c;
for (i = 0; i < s.length; i++)
{ 
c = s.charAt(i);//字符串s中的字符
if (bag.indexOf(c) > -1) 
return c;
}
return "";
}