[eSekar]

That block doesn't have a Stylevar, you will have to Edit the CSS manually,

in search.css :

Find:

PHP Code:

#searchtypeswitcher li a {
    display:block;
    padding:5px 10px;
    margin-{vb:stylevar right}:5px;
    background-color:#97b1c2;
    float:{vb:stylevar left};
        clear: {vb:stylevar right};
    color:#FFF;
    text-decoration:none;
    -moz-border-radius-top{vb:stylevar right}: {vb:stylevar border_radius};
    -moz-border-radius-top{vb:stylevar left}: {vb:stylevar border_radius};
    -webkit-border-top-{vb:stylevar right}-radius: {vb:stylevar border_radius};
    -webkit-border-top-{vb:stylevar left}-radius: {vb:stylevar border_radius};
}

#searchtypeswitcher li.selected a {
    background-color:#5a7f97;
}

#searchtypeswitcher li a:hover {
    background-color:#5a7f97;
} 


Change "background-color:#5a7f97;" to any color you'd like,
Same goes for Hover & selected, you may choose a different color for those.

Cheers.