PLS HELP I n my cooke login to only appear if cookie has been cleared

I have this html code I found on this site I've addapted ti to work with my website the only thing is I need it to only pop up if the cookie has been clear form the pc, else go directly to the website. here is my scrpit:

Bake Cookie

<!DOCTYPE HTML public "-//W3C//DTD HTML 4.0 Transitional//EN">

Please type your name

Click ENTER to set the one time only UserName

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