var user = "crystalsestate"; //for example - "joe_bloggs"
var domain = "yahoo.com"; //for example - "hotmail.com"
var subject = "Info from Crystals Estate Sales Web Site"; //for example = "website feedback"
var bodytext = "Enter your message here"; //for example - "dear Joe, here are my comments"
document.write('<a href=\"mailto:' + user + '@' + domain + '?subject=' + subject + '&body=' + bodytext + '\">'); 
document.write('<img id="imgemail" src="images/SiteWide/emailflat.jpg" alt="Email Crystals Estate Sales for further info" ></a>');