Lots of tutorials on how to do this :-) You create a simple html page, but use inline styling instead of using a stylesheet:
Start here:
http://www.sitepoint.com/article/code-html-email-newsletters/
http://www.sitepoint.com/article/designers-guide-html-email/
http://www.sitepoint.com/article/principles-beautiful-html-email/
Mail Chimp and iContact have some excellent templates and tutorials to help you get started with HTML email campaigns.
http://www.mailchimp.com/resources/
http://www.icontact.com/home/index2
CampaignMonitor does not recommend the use of image maps because of poor support by Gmail:
http://www.campaignmonitor.com/blog/post/2432/do-image-maps-work-in-html-ema/
MailChip recommends being careful with image placement as many email clients will automatically block images when the mail is first loaded:
http://www.mailchimp.com/articles/stupid-html-email-design-mistakes/
Hope this helps :-)
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Nadia
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