form name=infoForm action="c.php" method="POST" >
Prefer Login Name :
</td>
<td height=26><input type=text name=MemberCode style="width:220px; " /><input type="button" name="CheckCode" onclick="checkCode(document.infoForm.MemberCode.value);" value="Check">3-20 bit Member Code<input type="submit" value="OK"><script language="javascript">
function checkCode(code)
{
if(code.value == '')
{
alert("Member Code is error");
code.focus();
}
}</script>
Prefer Login Name :
</td>
<td height=26><input type=text name=MemberCode style="width:220px; " /><input type="button" name="CheckCode" onclick="checkCode(document.infoForm.MemberCode.value);" value="Check">3-20 bit Member Code<input type="submit" value="OK"><script language="javascript">
function checkCode(code)
{
if(code.value == '')
{
alert("Member Code is error");
code.focus();
}
}</script>
Maybe you can use GET or use js on c.php to control the page.