<SCRIPT LANGUAGE="JavaScript">
<!--
function Juge(theForm)
{
if (theForm.email.value == "")
{
alert("请您输入\"email\"!");
theForm.email.focus();
return (false);
}
var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_@.";
var checkStr = theForm.email.value;
var allValid = true;
for (i = 0; i < checkStr.length; i++)
{
ch = checkStr.charAt(i);
for (j = 0; j < checkOK.length; j++)
if (ch == checkOK.charAt(j))
break;
if (j == checkOK.length)
{
allValid = false;
break;
}
}
if (theForm.email.value.length < 6)
{
allValid = false;
}
if (!allValid)
{
alert("您输入的 \"电子邮件地址\" 无效!");
theForm.email.focus();
return (false);
}
address=theForm.email.value;
if(address.length>0)
{
i=address.indexOf("@");
if(i==-1)
{
window.alert("对不起！您输入的电子邮件地址是错误的！")
theForm.email.focus();
return false;
}
p=address.indexOf(".")
if(p==-1)
{
window.alert("对不起！您输入的电子邮件地址是错误的！")
theForm.email.focus();
return false;
}
}
}
//-->
</script>
<body>
<form method="post" onSubmit="return Juge(PostTopic)" name="PostTopic">
电子邮件：
<input type="text" name="email" maxlength="30" size="25" style="border:1px double rgb(88,88,88);font:9pt">
<input type="submit" name="Submit" value="提交">
</form>
</body>