Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
America's Got Talent
Table title:
Judges and presenters
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Season </th><th colspan=1 rowspan=1 > Presenter </th><th colspan=4 rowspan=1 > Judges (in order of appearance) </th></tr>
<tr> <th colspan=1 rowspan=1 > 1 </th><td colspan=1 rowspan=1 > Regis Philbin </td><td colspan=1 rowspan=6 > Piers Morgan </td><td colspan=1 rowspan=4 > David Hasselhoff </td><td colspan=1 rowspan=1 > Brandy Norwood </td><td colspan=1 rowspan=7 > N/A </td></tr>
<tr> <th colspan=1 rowspan=1 > 2 </th><td colspan=1 rowspan=2 > Jerry Springer </td><td colspan=1 rowspan=6 > Sharon Osbourne </td></tr>
<tr> <th colspan=1 rowspan=1 > 3 </th></tr>
<tr> <th colspan=1 rowspan=1 > 4 </th><td colspan=1 rowspan=8 > Nick Cannon </td></tr>
<tr> <th colspan=1 rowspan=1 > 5 </th><td class="highlighted"  colspan=1 rowspan=10 > Howie Mandel </td></tr>
<tr> <th colspan=1 rowspan=1 > 6 </th></tr>
<tr> <th colspan=1 rowspan=1 > 7 </th><td colspan=1 rowspan=4 > Howard Stern </td></tr>
<tr> <th colspan=1 rowspan=1 > 8 </th><td class="highlighted"  colspan=1 rowspan=6 > Mel B </td><td class="highlighted"  colspan=1 rowspan=6 > Heidi Klum </td></tr>
<tr> <th colspan=1 rowspan=1 > 9 </th></tr>
<tr> <th colspan=1 rowspan=1 > 10 </th></tr>
<tr> <th colspan=1 rowspan=1 > 11 </th><td class="highlighted"  colspan=1 rowspan=4 > Simon Cowell </td></tr>
<tr> <th colspan=1 rowspan=1 > 12 </th><td colspan=1 rowspan=2 > Tyra Banks </td></tr>
<tr> <th colspan=1 rowspan=1 > 13 </th></tr>
<tr> <th colspan=1 rowspan=1 > 14 </th><td colspan=1 rowspan=1 > Terry Crews </td><td colspan=1 rowspan=1 > Gabrielle Union </td><td colspan=1 rowspan=1 > Julianne Hough </td></tr>
</table>
Question:
Who were the judges of America's got talent?
Answer:
America's Got Talent's judges were Simon Cowell, Howie Mandel, Heidi Klum and Mel B.