I am displaying an image (saved in Static resource) on a click of button on Lead's detail page. I need to add a button to send an email which automatically attaches this image and should have Lead's name/email ID in "To" (just like the default Salesforce's "Send an Email" button), which I think can be done by Email Template. But how can we open the template with already attached Image. Kindly suggest. Thanks in advance
You can use parameters to the standard salesforce email page for this - see here. Then in your E-Mail Template you can specify which fields to use and they will be pre-filled automatically.