Insert subject line in existing e-mail javascript

Hello everyone,
I found this beautiful javascript somewhere on the net (unfortunately I can't remember exactly where),

I would like to add a subject to this script.

As a total beginner, I need the help of the specialists here.

How and where do I add a subject to the existing script without changing anything else to the script?

allgood();
function allgood()
{
var adr="info@datenschutz-roemer.de";
for (var i=0;i<this.numFields;i++)
{
var fName=this.getNthFieldName(i);
var f=this.getField(fName);
if (f.name == "E-Mail")
{
if(f.value != "")
{
adr=f.value;
}
}
}
if (adr=="")
{
app.alert("Keine E-Mail-Adresse angegeben!");
}
else
{
this.mailDoc({bUI: true, cTo: adr});
}
}

Thanks everyone in advance

Nikolaos.