Adding Subject Line text to Javascript code

Hi,

I have been using the below code, which I found on this community, to alert required fields which works fine when all is good and the email pops up it is missing the subject line, can anyone help with the Javascript to add text to the Subject Field

Thanks in advance

Paul

var emptyFields = []; for (var i=0; i<this.numFields; i++) { var f= this.getField(this.getNthFieldName(i)); if (f.type!="button" && f.required ) { if (f.defaultValue==f.valueAsString) emptyFields.push(f.name); } } if (emptyFields.length>0) { app.alert("Error! You must fill in the following fields:\n" + emptyFields.join("\n")); } else this.mailDoc({cTo: "Colette.Williams@sjp.co.uk"});