[callimuc]

You could also short the script by doing something like this

PHP Code:

function onKeyPressed(code, key) {
  if (key == "b") {
    if (this.boots == false) {
      this.boots = true;
      player.chat = "Boots on!";
    }
    else if (this.boots == true) {
      this.boots = false;
      player.chat = "Boots off!";
    }
  }
} 


OR

PHP Code:

function onKeyPressed(code, key) {
  if (key == "b") {
    this.boots = !this.boots; //change boolean
    player.chat = "Boots "@ (this.boots? "on!" : "off!"); //boots are on or off
  }
} 


Well with the

PHP Code:

this.boots = !this.boots; 


is something like gunderak said. It changes the boolean (true to false or false to true). Gunderaks post might also help.

And

PHP Code:

(this.boots ? "on!" : "off!"); 


is also very nice (in my opinion). It´s like also checking the boolean. This example might help

PHP Code:

player.chat = this.booleancheck ? "The boolean is true!" : "The boolean is false!";

//or

this.booleancheck ? BooleanTrue() : BooleanFalse();
  //if the statement is true, start the function "BooleanTrue()" else if the
  //statement is false, start the function "BooleanFalse()"

function BooleanTrue() {
  player.chat = "The boolean is true!";
}

function BooleanFalse() {
  player.chat = "The boolean is false!";
} 


If there are any questions or suggestions about this just ask