Renderin, Subregions

hello everybody ; got a script that worked fine before; but no more to render sub regions:

get a scriptt wich allows to render,different regions with Maya renderer:

global proc get_RenderRegions( int $x_res, int $y_res,
int $x_reg, int $y_reg,
string $image, string $file )
{
int $x_step = floor( (float)$x_res/(float)$x_reg );
int $y_step = floor( (float)$y_res/(float)$y_reg );

if( $x_res % 2 != 0 ) {
error( "X resolution must be even" );
}
if( $y_res % 2 != 0 ) {
error( "Y resolution must be even" );
}

int $x, $y;
int $image_index = 0;
for( $x=0; $x<$x_res; $x+=$x_step )
{
for( $y=0; $y<$y_res; $y+=$y_step )
{
string $command = "Render";
$command += " -x "+$x_res+" -y "+$y_res;
$command += " -xl "+$x+" -xr "+($x+$x_step-1);
$command += " -yl "+$y+" -yh "+($y+$y_step-1);
$command += " -im "+$image+"_"+$image_index;
$command += " "+$file;

print( $command+"n" );

$image_index++;
}
}
}

Then, i type for instance:

get_RenderRegions( 6000, 6000, 3, 3, "pane", "C:tempballs.mb" );

Maya script editor,then give 9 lignes ,as following:

Render -x 6000 -y 6000 -xl 0 -xr 1999 -yl 0 -yh 1999 -im pane_0 C:tempballs.mb
Render -x 6000 -y 6000 -xl 0 -xr 1999 -yl 2000 -yh 3999 -im pane_1 C:tempballs.mb
Render -x 6000 -y 6000 -xl 0 -xr 1999 -yl 4000 -yh 5999 -im pane_2 C:tempballs.mb
Render -x 6000 -y 6000 -xl 2000 -xr 3999 -yl 0 -yh 1999 -im pane_3 C:tempballs.mb
Render -x 6000 -y 6000 -xl 2000 -xr 3999 -yl 2000 -yh 3999 -im pane_4 C:tempballs.mb
Render -x 6000 -y 6000 -xl 2000 -xr 3999 -yl 4000 -yh 5999 -im pane_5 C:tempballs.mb
Render -x 6000 -y 6000 -xl 4000 -xr 5999 -yl 0 -yh 1999 -im pane_6 C:tempballs.mb
Render -x 6000 -y 6000 -xl 4000 -xr 5999 -yl 2000 -yh 3999 -im pane_7 C:tempballs.mb
Render -x 6000 -y 6000 -xl 4000 -xr 5999 -yl 4000 -yh 5999 -im pane_8 C:tempballs.mb

type those in prompt but -xl : invalid flag what's wrong ???

-yl -yr -yh -yl

are reprlaced with - reg

type render -? for more info.

Also check your pm.

Render -x 6000 -y 6000 -reg 0 1999 0 1999 -im pane_0 C:\Temp\bol.mb