#mainContentBlock1 
{
    border: none;
    height: auto;
}

#mainContentBlock2 table 
{
    border-top: 1px solid #000000;
    width: 686px;
}

#mainContentBlock2 th 
{
    border-bottom: 1px solid #000000;
}

#mainContentBlock2 .contentItem 
{
    border: none;
}