Evaluting form variables

Hello Folks! This is probably the simplest problem but we're stumped. We've set up a simple HTML form and now would like to evaluate the submitted form variables. Eg. Form variable name: <input type="text" name="D0_0600SHOW "> Script: printf("The value is", $D0_0600SHOW); Output: "The value is " It's as if the variable doesn't exist. I've sent the same form variable to another scripting language that I use and it works just fine. What could I be doing wrong? Thanks ahead of time! Jr.