<style type="text/css">
.backgroundOne
{
background-image:url(../images/bg_one.gif);
background-repeat:repeat-x;
}
.backgroundTwo
{
background-image:url(../images/bg_two.gif);
background-repeat:repeat-y;
}
</style>
... then in the body of your document ...
<table width="500" cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="backgroundOne"> </td>
<td class="backgroundTwo"> </td>
</tr>
</table>