I am trying to put an iFrame as my main content box so that, when a user clicks a link at the top, it will appear in the iFrame. (links would be target="content" or something to that..)

I am not sure how to do it. Below is my code for the main body...Any help?

HTML Code:
 <tr>
    <td colspan="4" bgcolor="#003366"><img src="mm_spacer.gif" alt="" width="1" height="1" border="0" /></td>
  </tr>
 <tr>
    <td width="40">&nbsp;</td>
    <td colspan="2" valign="top">&nbsp;<br />
    &nbsp;<br />
   <table border="0" cellspacing="0" cellpadding="2" width="504">
        <tr>
          <td class="pageName">Welcome to MySlashTruck.COM! </td>
        </tr>
        <tr>
          <td class="bodyText"><p style="margin-top: 0;">Welcome to MySlashTruck.COM, where we supply all of your truck needs!  Please take this opportunity to explore our site, and look at the many different things we have to offer!  Please also do take time to explore our forums where you may engage with other people who own slash trucks, and may get help on what to buy/get for your Slash Truck!</p>		  </td>
        </tr>
      </table>
	   <br />	  </td>