A few comments:

• You never read in the value of the cookie you want to edit - so how do you know what other links have been saved.
• The two cookies you create have different names - is this right?
• One of your cookies is set to expire immediately (one hour ago).
• Don't let Hutton get you down :-)

To acheive what you are after I would suggest:

get value off cookie

do we want to add or remove link to cookie value
       add: add the link, trim if needed to 5 values
    remove: remove link

save new cookie value && redirect to new page.
[download]

HTH.

Update: removed comment on html in code.

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