3 answers
@Megan Brooks I did, however I don't remember exactly how as it was something peculiar I had to trial and error with the URL hack method. Check out these articles- http://thewizardnews.com/2014/01/30/url-hack-revisted-auto-select-email-template-with-custom-button/http://www.salesforceben.com/salesforce-email-url-hack-tutorial/Best of luck!