function scr_var(arg0, arg1)
{
    variable_instance_set(id, arg0, arg1);
}

function scr_var_add(arg0, arg1)
{
    variable_instance_set(id, arg0, variable_instance_get(id, arg0) + arg1);
}

function scr_var_mult(arg0, arg1)
{
    variable_instance_set(id, arg0, variable_instance_get(id, arg0) * arg1);
}