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Passing a parameter in "mailto:" or similar.

Passing a parameter in "mailto:" or similar.

I currently have an inquiry / advice email facility on my site using the simple:

<a href="mailto:email@url">Send email</a>

I want to replace this with a facility to include a 4 digit code somewhere in the email, presumable the subject line or the body. The code is available in js from a cookie, and is different for each client. Can anyone please tell me if this is possible in html / js, and how to go about it?

Ideally I would like to be able to insert a fixed subject line in the email form (i.e. the same for all users) followed by the variable code, with the body blank so the user can fill in his / her question.

Or should I use a form with the "action=mailto" facility? If I go this route, can I set up the "subject=" field as a string including a variable, or can it only be a fixed text string? Would I use a ("textstring"+variable.value) form? Excuse my ignorance.

Thanks for you help.

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