function genEmailLink (o) {
    var subjTxt = "subject=" + encodeURIComponent ("ESRI Help Topic")
    var bodyTxt = "body=" + 
              encodeURIComponent ("Here is a useful topic I found on esri.com: ") + 
              encodeURIComponent (window.location.href)                
    o.href = "mailto:?"+ subjTxt + "&" + bodyTxt                
}