Not getting the changed value

Veeresh

Sir,

I have a function (say getAbsValue()) which is defined & declared in main form.
I am calling this function from the script like -

int a = -999;

{
getAbsValue(a);
ShowMessage(a);

}

I am not getting the changed value why?
Is reference variable in function allowed in the script?

Please help me

Thanks
-Veeresh