var myStylesDoc = app.open(File("styles.indd")); 
var myDocument = app.open(File("mydocument.indd")); 
 
function copyStyles(source, destination) { 
	$.writeln(source); 
 
	// loop through paragraph styles to copy: 
	backStyles = source.everyItem().name; 
	for (j = backStyles.length - 1; j > 0; j--) { 
		bStyle = source.item(j); 
		if (bStyle.name == null || bStyle.name == '[Einfacher Absatz]' || bStyle.name == 'undefined') continue; 
 
		// find style in new document if it is available: 
		newStyle = true; 
		for (i = destination.everyItem().name.length - 1; i > 0; i--) { 
			if (myDocument.paragraphStyles.item(i).name == bStyle.name) { 
					newStyle = false; 
					style = destination.item(i); 
			} 
		} 
 
		// add new style if not yet available: 
		if (newStyle) { 
			style = destination.add(); 
		} 
 
		// copy style properties: 
		style.properties=bStyle.properties; 
	} 
} 
 
 
// copy styles: 
copyStyles(myStylesDoc.characterStyles, myDocument.characterStyles); 
copyStyles(myStylesDoc.paragraphStyles, myDocument.paragraphStyles); 
copyStyles(myStylesDoc.tableStyles, myDocument.tableStyles); 
copyStyles(myStylesDoc.cellStyles, myDocument.cellStyles); 
 
// save file: 
myDocument.save(File("newfile.indd")); 
 
// close				 
app.documents.item(0).close(); 
app.documents.item(0).close();