double the number of the guest

[adoobi]

Hello
I need a little code customization in my forum:
I need to make the number of the guest in my forum to double. For example if I have 2 guest it should show 4 , if I have 4 it will show 8 and so on..
So what I have done is :
On the online.php before the following line :
$totalonline = $numbervisible + $numberguests;
I add this line
$numberguests = $numberguests * 2 ;

So now the forum show my guest multiplied 2 , but the problem is when it comes to table which it show the guests and users, it show the actual guests I have and it wont make it double.
So do you have any idea I can make the number of these to double. I want that each guest to be shown 2 times in the table..