<td width="844" height="13" bgcolor="#4A9324" align="center">
<form id="form5" name="form5" method="post" action="">
<input type="text" name="textfield" width="500" />
<input type="submit" name="Submit5" value="提交" />
</form>
</td>
<form id="form5" name="form5" method="post" action="">
<input type="text" name="textfield" width="500" />
<input type="submit" name="Submit5" value="提交" />
</form>
</td>
或
<input type="text" name="textfield" style="width:500px;" />