var sSubject = 'Interesting Web Page';
var sBody    = 'Hello,' + ' I found this webpage, and thought that it would interest you: ' + location.href;
var sDisplay = 'Email this page';
document.write(
    '<a href="mailto:'
    + '?subject=' + escape(sSubject)
    + '&body=' + escape(sBody)
    + '">' + sDisplay + '</a>'
    );