div.tab_tabulka
{
min-width: 1px;
_width: 1px; /* IE */
width: 100%;
padding-left: 2px;
border: 1px solid blue;
}

div.tab_riadok
{
clear: left;
}

div.tab_bunka
{
float: left;
width: 50%;
margin: -1px;
border: 1px solid green;
}

div.tab_bunka2
{
border: 1px solid red;
float: left;
width: 100%;
margin: -1px;
}

div.tab_hlavicka
{
font-weight: bold;
}

div.tab_cl
{
clear: both;
}

div.tab_text
{
padding: .2em .5em;
}