var TF = app.activeDocument.textFrames;  
for( oneTF = 0; oneTF < TF.length-1; oneTF++ )  
   TF[oneTF].applyObjectStyle(app.activeDocument.objectStyles.item("MeinObjektStilNamen"),true) 

//ApplyObjectStyle2StoryTextframes.jsx 
if(app.documents.length != 0){ 
	if(app.selection.length != 0){ 
		var mySelection = app.selection[0]; 
		switch(mySelection.constructor.name){ 
			case "Text": 
			case "InsertionPoint": 
			case "Character": 
			case "Word": 
			case "Line": 
			case "TextStyleRange": 
			case "Paragraph": 
			case "TextColumn": 
			case "TextFrame": 
			myAssignObjectStyle(mySelection.parentStory); 
			} 
	} 
} 
function myAssignObjectStyle(myStory){ 
	var myDoc = app.documents[0];  
	var myTFs = myStory.textFrames; 
	for( oneTF = 0; oneTF < myTFs.length; oneTF++ ){ 
		myTFs[oneTF].applyObjectStyle(myDoc.objectStyles.item('MeinObjektStilName'), true); 
		} 
}