Sapscript: position OBJECT GRAPHICS ID

Hi all,

I hope there is someone can help me...

My problem is: i've used the istruction to insert an image in a Sapscript

/: BITMAP 'LOGO_TOPAZIO_DATI1' OBJECT GRAPHICS ID BMAP TYPE BCOL

now, how can i position the image in the centre of page?

Thanks a lots,

regards,

Alex.