<table>
</tr>
</thead>
<tr>
<a href="" class="mainmenu" /><img title="Overlord" src="https://lh3.googleusercontent.com/-wmXOMSvGdqE/W1olljMPl8I/AAAAAAAAASE/zcrXBcEDR5Q72zGVf24_41unNrU-fE7DACEwYBhgL/w140-h87-p/HALF_LIFE_3_WALLPAPERS_IN_HD.jpg" alt="" HSPACE="20"></a>
</tr>
<tr>
<a href="" class="mainmenu" /><img title="Overlord" src="https://lh3.googleusercontent.com/-wmXOMSvGdqE/W1olljMPl8I/AAAAAAAAASE/zcrXBcEDR5Q72zGVf24_41unNrU-fE7DACEwYBhgL/w140-h87-p/HALF_LIFE_3_WALLPAPERS_IN_HD.jpg" alt="" HSPACE="20"></a>
</tr>
<tr>
<a href="" class="mainmenu" /><img title="Overlord" src="https://lh3.googleusercontent.com/-wmXOMSvGdqE/W1olljMPl8I/AAAAAAAAASE/zcrXBcEDR5Q72zGVf24_41unNrU-fE7DACEwYBhgL/w140-h87-p/HALF_LIFE_3_WALLPAPERS_IN_HD.jpg" alt="" HSPACE="20"></a>
</tr>
</table>
tabla
tr (tu linea)
th
th horizontales aqui meti la etiqueta <p>
th
tr
tr (tu otra linea)
td
td verticales
td
tr