how do i load a new image on cisco router

[grassroot]

Hello. I am very new here (and to routers). I stumbled across this. I tried and got the message
TFTP: Error, Insufficient flash installed to load image
Whats next?

rommon1>set
rommon2>IP_ADDRESS=x.x.x.x
rommon3>IP_SUBNET_MASK=y.y.y.y
rommon4>DEFAULT_GATEWAY=x.x.x.x
rommon5>TFTP_SERVER=x.x.x.x
rommon6>TFTP_FILE=c7200-bla-blabla.whatever
rommon7>tftpdnld
Then it goes through and posts what the parameters you set are...then it says something like
"This is for disaster recovery only...all files on flash will be lost, dude!
Do you wish to continue? y/n:  [n]:  y

Then it should get the file and load it onto the flash, and it erases it before that (eeeeeeeeeeeeeeeeeeeeeeeeeeeeeee...)
This should work as long as you have everything connected correctly and all parameters set correctly...
VERY IMPORTANT! All commands I just typed above that are in CAPS MUST BE IN CAPS! And all others (set, tftpdnld) must be in small letters.
If you have too much trouble with this, just use XModem (with HyperTerminal). This you can Google.

Tim