How do limit one sentry!!

If I take one sentry how to put that I can not take the next sentry while this does not destroy that I set?
to limit sentry at the current player who took it that he can not take another until you destroy this as it is set..

plss help..

// Moved, to correct forum.

Is it really that hard to make a variable based If, else statement?

On player connect set

PHP Code:

---

self.isUsingSentry = False; 


---

And then

PHP Code:

---

if(self.isUsingSentry != True)
{
    self.isUsingSentry = True;
    // Your sentry script goes here,
    // Wait until the sentry is over and set self.isUsingSentry back to False
    self.isUsingSentry = False;

}
else
{
    self iPrintlnBold("You have already planted a sentry gun, please wait until it's over !");
} 


---

Of course self in this case is the player [entity].