Show New fields if one radio button option is selected

I have a very simple form that writes to a database. It asks -do you rent or own?
if they rent, I need to ask for Landlord Information

I don't want to show the fields of the form unless they say they rent and I still need it to save to the database...

<table><tr>  <td>Do you?  </td>
              <td>
<?PHP echo"<input type=\"radio\" name=\"Res1Rent\" value=\"Rent\" checked=true> Rent
<input type=\"radio\" name=\"Res1Rent\" value=\"Own\"> Own\n";?>
 </td>
            </tr>
        THESE FIELDS WON"T SHOW UNLESS RENT OPTION IS SELECTED ABOVE

<tr><td colspan="4">Please list Landlords Information</td></tr><tr><td>Name:</td><td><?PHP echo "<input type=\"text\" name=\"Landlord1\" value=\"$Landlord1\">\n";?></td><td>Address</td><td><?PHP echo "<input type=\"text\" name=\"LL1Address\" value=\"$LL1Address\" />\n";?></td></tr><tr><td>Phone</td><td><?PHP echo "<input type=\"text\" name=\"LL1Phone\" value=\"$LL1Phone\"/>\n";?></td><td></td></tr></table>

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