Hi,
I cant tell, but it looks like you are already keeping track of the number of votes with this code:
$"UPDATE vote SET roster=roster+1
If that is the case, all you have to do is select it and echo it.
$sql = "SELECT roster FROM vote";
$get_rost= mysql_query($sql) or die(mysql_error());
$votecount = mysql_result($get_rost, 0);
and then anywhere you wanted to put it on the page you would use something like:
echo "The total number of votes is $votecount.";
I hope that helps.