PHP variables as table name

[alen.pros]

Is there any way I could use php variable as table name in mysql select query? Example:

<?php
$razred=$_POST['droprazred'];
$odjel=$_POST['dropodjel'];
$odabrano=$razred.$odjel;
$upit="select * from '$odabrano'"; /*this doesn't work, is there any way I could make this work, or it's just mission impossible*/
$link=mysql_connect("localhost","username","password");
if ($link) {
if (mysql_select_db("test",$link)) {
if ($rezultat=mysql_query($upit)) {
while ($zapis=mysql_fetch_assoc($rezultat)) {
echo $zapis["id"].". ".$zapis["name"]
."<br>";
}
mysql_free_result($rezultat);
}
else echo "Trazena tablica ne postoji.";
}
mysql_close($link);
}
?>