prova così:

<tr>"><form name="form1" method="post" action="Registrazione/login.asp">
<td align="center" valign="middle" width="750" height="20" bgcolor="#00B24d">
<div align="right
<input type="text" name="login" class="form" size="8" onBlur="if (value == '') {value = 'login...'}" onFocus="if (value == 'login...') {value =''}" value="login...">
<input type="password" name="pass" class="form" size="8">
<input type="submit" name="Submit" value="Invia" class="form">
<input type="hidden" name="doit" value="log">
</div>
</td></form>
</tr>