//ref : http://forums.adobe.com/thread/594393
function saveJPEG( doc, saveFile, qty ) {
     var saveOptions = new JPEGSaveOptions( );
     saveOptions.embedColorProfile = true;
     saveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
     saveOptions.matte = MatteType.NONE;
     saveOptions.quality = qty; 
     doc.saveAs( saveFile, saveOptions, true );
}
//saveJPEG( app.activeDocument, new File('~/Desktop/sample.jpg'), 10 );
 
var doc = app.activeDocument;
var docName = doc.name;
docName = docName.match(/(.*)(\.[^\.]+)/) ? docName = docName.match(/(.*)(\.[^\.]+)/):docName = [docName, docName];
var suffix = '_publish';
var savedName = decodeURI(doc.path)+'/'+docName[1]+suffix+'.jpg'
if (! File(savedName).exists ){
     var savedFile = new File(decodeURI(doc.path)+'/'+docName[1]+suffix+'.jpg');
     saveJPEG( app.activeDocument,savedFile, 10 );
}