$kod1 = "<td class='sub-header'><table width='100%' border='0' cellpadding='4' cellspacing='0' style='background-image:url(".THEME."header/logo1.png);border:#8A8573 1px solid;'><tr>";   

$kod2 = "<td class='sub-header'><table width='100%' border='0' cellpadding='4' cellspacing='0' style='background-image:url(".THEME."header/logo2.png);border:#8A8573 1px solid;'><tr>";   

$kod3 = "<td class='sub-header'><table width='100%' border='0' cellpadding='4' cellspacing='0' style='background-image:url(".THEME."header/logo3.png);border:#8A8573 1px solid;'><tr>";   

$kod4 = "<td class='sub-header'><table width='100%' border='0' cellpadding='4' cellspacing='0' style='background-image:url(".THEME."header/logo4.png);border:#8A8573 1px solid;'><tr>";   

$zmiana = array($kod1, $kod2, $kod3, $kod4);   

$losuj = rand(0,1,2,3);   

echo $zmiana[$losuj];