Some servers seem to not like HTML inside the echo statements like that. Try this:
80 // If we found the banner, we'll send the output
81 // otherwise there just won't be a box.
82 if ($Banner) {
83 echo "
84 $tbopen
85 <tr>
86 <td align="center" class="darktable">
87 <b>Support Our Site - $Title</b>
88 </td>
89 </tr>
90 <td align="center" class="lighttable">
91 $Banner
92 </td>
93 </tr>
94 $tbclose
95 <br />
96 ";
97 }
Note the change in the echo statements and that a \ was added before each quote mark.
