Scriptographer.org - Do something with a selected...

Hi,

I can do something with a selected textbox for example like giving every character a different size.
Only i want to be able to do stuff with selected text instand of all.
Is this possible?

Like how you normally can select a word and make it bold for example.

You can use the textItem.selection range:

var selectedItems = document.getItems({
	type: TextItem,
	selected: true
});

if(selectedItems.length) {
	var textItem = selectedItems[0];
	var selection = textItem.selection;
	selection.characterStyle.fontSize += 10;
}