Change script function, can you?

Hi everyone

I got this script,

function: change font size in selection

but I want to change the function to selection text frames

I mean: change the font size in all the selected text frames.

thanks

//---------------------------------------------------------------------------------------- -----------------------

var the_document = app.documents.item(0);

var the_selection = app.selection[0];

var the_dialog = app.dialogs.add({name:"Resize selected text"});

with(the_dialog.dialogColumns.add()){

    with(dialogRows.add()){

        staticTexts.add({staticLabel:"Resize the selected text by"});

        var increase_by = measurementEditboxes.add({editUnits:MeasurementUnits.POINTS, editValue:0});

    }

}

the_dialog.show();

counter = 0;

do {

    var current_character = the_selection.characters.item(counter);

    current_character.pointSize = current_character.pointSize + increase_by.editValue;

    counter++;

} while (counter < the_selection.characters.length);

alert("Done!");

//---------------------------------------------------------------------------------------- ------------------------

VK