PHP to open email client

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I'm working on a script to allow my clients to send an email to their customers through my cart system. I could have the email send from my server, but I would prefer to have the script pop up their email client and fill in the To: line with the addresses of their customers that are stored in the cart system.

Is there a way to open the mail client using PHP or do I need to simply generate a mailto: link for them to click on?

[jatar_k]

the mailto link is your best bet

[too much information]

thanks, that's what I thought.

I was just looking for something a little more "fancy"