css problem on iPad with table border

Question

I have a css problem when the html page is rendered on iPad. Everything works good in other browsers. The problem is that I get a small space between the cells in my tables as you can see in the picture: http://oi53.tinypic.com/2vl0as9.jpg

If I zoom in the page maximum on the line between the cells, it dissappears.. So it must be some kind of bug when the page is rendered. Can I go around this in some way? This is my table and css:

<table class="smallTable" cellpadding=0 cellspacing=0>
    <tr>
        <td class="td1"></td>
        <td class="td2"></td>
    </tr>
    <tr>
        <td class="td1"></td>
        <td class="td2"></td>
    </tr>
</table>

CSS:

.smallTable 
{
    margin: 20px auto 40px auto;
    border-spacing: 0;
}

.smallTable td
{
    margin: 0;
}

.smallTable td.td1 
{
    background: url(../images/table1.png);
}

.smallTable td.td2 
{
    background: url(../images/table2.png);
}