rem: numSelected, selectionArray); 
add: numSelected, selectionArray, statusFeedback); 
context: function PrintEnginePrint(){	var tree = GetThreadTree();	var selectedItems = tree.selectedItems;	var numSelected = selectedItems.length;  if (numSelected == 0)  {    dump("PrintEnginePrint(): No messages selected.\n");    return false;  }  	var selectionArray = new Array(numSelected);	for(var i = 0; i < numSelected; i++)	{		selectionArray[i] = selectedItems[i].getAttribute("id");	}  printEngineWindow = window.openDialog("chrome://messenger/content/msgPrintEngine.xul",								                        "",								                        "chrome,dialog=no,all",								                        numSelected, selectionArray);  return true;}
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