xlock claled before suspend to disk

Dear more experienced SUSE users,

I am to lock my X server screen begfore suspend to RAM, but my ACPI experiences are not huge,too. Can anyone sugest me how to do so in SUSE 11.0.

I am fammilar to Unix, because I use diffrent Unixes since 1995, but I was never before SUSE 11.0 used suspend to disk/RAM because with one exception my machines were AT not ATX form.