<script language="JavaScript">
<!--
function CheckForm()
{
if (document.form.yourname.value == "" )
{
alert ("请输入姓名！");
return false;
}

var Letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
for (i=0; i < document.form.yourname.value.length; i++)
{
var CheckChar = document.form.yourname.value.charAt(i);
CheckChar = CheckChar.toUpperCase();
if (Letters.indexOf(CheckChar) == -1)
{
alert ("请输入英文姓名！");
return false;
}
}

}
// -->
</Script>

<form action="" name="form" method="post" onSubmit="return CheckForm()">
<div align="center">
<input type="text" name="yourname">
<input type="submit" name="submit" value="submit">
</div>
</form>  

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