How to pass more then 9 params to a bat-script

Hello!

I call a bat-script from a ant-target.
The bat-script needs alot of params at startup.
It is called like:

<exec executable="cmd">
    <arg line="/c mybat ${param1} ${param2} ... ${param9}" />
</exec>

In the bat-script I initiate alot of variables like:

set var1=%1
set var2=%2
...
set var9=%9

The problem is that I need to pass param number 10.

set var10=%10

But then the variable, var10, gets value of param1.

So if any one got any solution or any better solution please let me know!

Best regards
Fredrik