Adding a vertical line to the right side of my web page?

I'm working with a script for my website. I want to add a solid vertical line down the right side of my main page, from header to footer. Can somoen tell me how/where I can add what code to accomplish this? Thanks.

Here is the main_page code:

<link href="../style.css" rel="stylesheet" type="text/css" />
<style type="text/css">
<!--
a:link {
	text-decoration: none;
}
a:visited {
	text-decoration: none;
}
a:hover {
	text-decoration: none;
}
a:active {
	text-decoration: none;
}
-->
</style><table width="770" cellpadding="0" cellspacing="1" bgcolor="#FFFFFF">
	<tr>
		<td width="174" align="left"valign="top" bgcolor="#A30100">
		<br /><a href="index.php"><font color="white"><strong>&nbsp;&nbsp;Home</strong></font></a><br /><br />
		<A href='index.php?command=signup_page'><font color="white"><strong>&nbsp;&nbsp;Signup</strong></font></A>
		<br /><br />
		[member_menu]&nbsp;</td>
		<td width="420" valign="top">[main_content]&nbsp;</td>
		
		<td width="174" valign="top" bgcolor="#FFFFFF" align="right">
			



<TABLE width="174" style='border:1px solid color:#A30100' cellpadding="4" cellspacing="1" >
			<form method="POST" action="index.php">
		<input class='field' type='hidden' name='command' value='account'>
		<input class='field' type='hidden' name='param' value='login'>
				<tr><td colspan='2' style='background-color:#A30100;color:white;font-size:12;font-weight:bold'>&nbsp;Login</td></td>

				<TR height='4px'><td height='4px'></td></TR>
				<tr>
					<td style='font-size:12px' class='fieldLabel'>&nbsp;Email &nbsp;Address</td>
					<td><input style='height:20px' class='field' type='text' size='12' maxlength="30" name='user_name' value='[user_name]'></td>	
				</tr>
				<tr>
					<td style='font-size:12px'  class='fieldLabel'>&nbsp;Password&nbsp;</td>
					<td><input style='height:20px' class='field' type='password' size='12' maxlength="30" name='password' >
					</td></tr>
				<TR height='1px' > 
					<td colspan='2' class='errorMessage' align="center"><SPAN style='font-size:11px'>[login_message]</SPAN></td>
				</TR>
				<tr><td colspan="2" align="center"  class='hLine'><A href='index.php?command=send_pass'><SPAN style='font-size:11px;'>Forgot password?</SPAN></A>&nbsp;<br />
					<center><input class='button' type='submit' value='Login'></center>
					
	
					</td>
				</tr>
				
			  </form>
			</TABLE>
<!--- Begin Text Under Logon Box  ----->

		<br />  
		
<!--- End Text Under Logon Box  ----->
		
	</tr>
</table>

Code (markup):

 

Add a <div> around your main content and add a style to that div to create the right side border.

 

Thanks.

Could be more specific?
like this: <div>border-right:1px solid #FFFFFF;</div> ?