Hi,
you can also download and unpack the rescatux-iso, toss the files from the live folder on your tftp and use this:
Label recatuxx86
menu label Rescatux - x86
text help
Rescue PC
endtext
KERNEL /rescatux/vmlinuz
APPEND initrd=/rescatux/initrd.img boot=live config noswap noquiet fetch=tftp://SERVERIP/linux/rescatux/filesystem.squashfs
Label recatuxx64
menu label Rescatux - x64
text help
Rescue PC
endtext
KERNEL /rescatux/vmlinuz2
APPEND initrd=/rescatux/initrd2.img boot=live config noswap noquiet fetch=tftp://SERVERIP/linux/rescatux/filesystem.squashfs
have fun