Trailing Stop for Account Balance

I would like to see a Trailing stop for my overall account balance. For example: If I’m up $1k Realized Profit. I would like my account to lock itself and close the trade if my Unrealized Profit, on the next trade, reaches half of the Realized Profit dollar amount (so $500 in this example). This would help keep me from going on TILT and giving back all of my profits and then DLLing like I usually do.

I guess to achieve this you would need to create a script that the user could customize using If-Then statements. ie. If I get over X amount of realized profit, then the Account Trailing Stop script would go into effect.