PHP errors - strange variables causing form corruption?

I cobbled together a really quick and dirty PHP to run a "dice-rolling" simulator. Sometimes, it works great. Other times, it gets into some weird state, when strange extra characters are injected into variable values and/or variable NAMES even! You can see an uploaded version at http://www.westergaard.ca/dierolling. php - if you key in something like "30d100+40 k20" (by which I mean roll 30 "100-sided" dice, keep the best 20, and add 40 to the resulting sum), then click "roll" a few times, you'll probably notice that at some point, the string "+/-" in the help text disappears. The next time you click "Roll" the system will stop giving roll results, will reset to rolling "3d6", and will ignore input. I've struggled with this till I'm red in the face. I'm stumped. Please, Help! :) I've also uploaded the source at http://www.westergaard.ca/dierolling. phpsrc The webserver at westergaard.ca is Linux, but I've also tested this on a Win2000 IIS webserver, and have the exact same results. If anyone has any clue what is going on, I'd really appreciate a suggestion. Thanks! Peter Westergaard peter@westergaard.ca ### ICQ#: 10294457 http://www.westergaard.ca/ ### http://courtly.livejournal.com ---------- 'Our response to being bored and rich is not to discard our possessions and live more simply, but to buy more stuff to reduce the space in which we might contemplate our shame.' - Stuart Jeffries "Robots without a cause" =================================================================== EASY and FREE access to your email anywhere: http://Mailreader.com/ ===================================================================