//Hello! This script looks at the object you've currently got selected, and if it's a text frame, it decreases the amount of columns in that frame by one.
//Useful for: quickly going back and forth between column layouts when setting out images etc.

var doc = app.activeDocument;
try {
	var textFrame = app.activeDocument.selection[0];
	var preferences = textFrame.textFramePreferences;
	if (preferences.textColumnCount > 1){
		preferences.textColumnCount = preferences.textColumnCount - 1;
	}
} catch (e) {
	alert(e);
}