What page isn't available? "boot.img" which you need will be on your cd's. here's what that link said about it:
The images directory on your Red Hat Linux CD-ROM contains the boot images for Red Hat Linux/x86. Once you have selected the proper image (such as boot.img for a CD-ROM-based installation or bootnet.img for a network installation), transfer the image file onto a diskette using one of the following methods.
Using the rawrite Utility
To make a diskette using MS-DOS, use the rawrite utility included on the Red Hat Linux CD-ROM in the dosutils directory. First, label a blank, formatted 3.5-inch diskette appropriately (such as "Boot Disk" or "Updates Disk"). Insert it into the diskette drive. Then, use the following commands (assuming your CD-ROM is drive D
D:\> cd \dosutils
Enter disk image source file name: ..\images\boot.img
Enter target diskette drive: a:
Please insert a formatted diskette into drive A: and
press --ENTER-- : [Enter]
First, rawrite asks you for the filename of a diskette image; enter the directory and name of the image you wish to write (for example, ..\images\boot.img). Then rawrite asks for a diskette drive to write the image to; enter a:. Finally, rawrite asks for confirmation that a formatted diskette is in the drive you have selected. After pressing [Enter] to confirm, rawrite copies the image file onto the diskette. If you need to make another diskette, label that diskette, and run rawrite again, specifying the appropriate image file.
The rawrite utility only accepts 8.3-type file names, such as filename.img. If you download an update image from http://www.redhat.com
named something similar to update-anaconda-03292002.img, you must rename it as updates.img before you run rawrite.
Using the dd Command
To make a diskette under Linux (or any other Linux-like operating system), you must have permission to write to the device representing a 3.5-inch diskette drive (known as /dev/fd0 under Linux).
First, label a blank, formatted diskette appropriately (such as "Boot Disk" or "Updates Disk"). Insert it into the diskette drive (but do not mount the diskette). After mounting the Red Hat Linux CD-ROM, change to the directory containing the desired image file, and use the following command (changing the name of the image file and diskette device as appropriate):
# dd if=boot.img of=/dev/fd0 bs=1440k
To make another diskette, label that diskette, and run dd again, specifying the appropriate image file.