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<script language="javascript">
function IsDigit(cCheck) { return (('0'<=cCheck) && (cCheck<='9')); }
functionIsAlpha(cCheck) { return ((('a'<=cCheck) &&(cCheck<='z')) || (('A'<=cCheck) && (cCheck<='Z'))) }
function VerifyInput()
{
strUserID = document.form1.username.value;
if (strUserID == "")
{
alert("請輸入您的用戶(hù)名");
document.form1.username.focus();
return false;
}
for (nIndex=0; nIndex<strUserID.length; nIndex++)
{
cCheck = strUserID.charAt(nIndex);
if ( nIndex==0 && ( cCheck =='-' || cCheck =='_') )
{
alert("用戶(hù)名首字符必須為字母或數字");
document.form1.username.focus();
return false;
}

if (!(IsDigit(cCheck) || IsAlpha(cCheck) || cCheck=='-' || cCheck=='_' ))
{
alert("用戶(hù)名只能使用英文字母、數字以及-和_，并且首字符必須為字母或數字");
document.form1.username.focus();
return false;
}
}
return true;
}
</script>