How to reverse the effect of the following execution by using Javascript? [duplicate]

This question already has answers here: Closed 10 years ago.

Possible Duplicate:

How to remove a cookie by using Javascrip开发者_运维百科t?

javascript:void(document.cookie=”PREF=ID=20b6e4c2f44943bb:U=4bf292d46faad806:TM=1249677602:LM=1257919388:S=odm0Ys-53ZueXfZG;path=/; domain=.google.com”);

How to eliminate the result of the statement above by writing another Javascript statement?

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To remove a cookie, do the same thing but set an expire date in the past:

In this case:

document.cookie=”PREF=ID=20b6e4c2f44943bb:U=4bf292d46faad806:TM=1249677602:LM=1257919388:S=odm0Ys-53ZueXfZG; expires=Thu, 01 Jan 1970 00:00:01 GMT; path=/; domain=.google.com”

The key is the addition of expires=Thu, 01 Jan 1970 00:00:01 GMT;