how do i make an email field from my sql appear as a link

I have a page on my website that shows clients details.  the page retrieves all information about the client's details from a mysql database.  I want people to be able to click on the client's email address so that they can directly email the client and also be able to click on their URL and it will take them direct to the client's website.   I have a recordset set up to show the details of a particular client. I have set up the email details as follows:-

<td>Email</td>
        <td><?php echo $row_rsDetails['Email']; ?></td>

If someone could let me know how to turn this into a link so that it emails the client directly i would be really greatful.  (Also, how to do the same with a URL)

Thanks