How do I create images in html format to send an email with a header please?

I can create images on photoshop and work has asked me to create a html header for their email newsletter ( that is one made from an image) How do I do this please? Thanks.How do I create images in html format to send an email with a header please?
You need to create the image in Photoshop and store it somewhere in your website folders. Then, in the newsletter that gets sent out, you can link to the image like this: %26lt;img src=';http://www.mywebsite.com/images/myi?alt=';Header'; /%26gt;