Import Icon to Button

I have created a form that only I use on my computer. I want to import pictures to various buttons. I have the following code added to a Mouse Up trigger in a Run a JavaScript action on a button. All of the button names are C01Picture, C02Picture, etc. However it doesn't work. Can you please advise me as to what I'm doing wrong?

var a = getField("C01Picture");

var b = getField("C02Picture");

var c = getField("C03Picture");

var d = getField("C04Picture");

var e = getField("C05Picture");

var f = getField("C06Picture");

a.buttonImportIcon("/C/Users/MyComputer/Desktop/Pictures/01.jpg");

b.buttonImportIcon("/C/Users/MyComputer/Desktop/Pictures/02.jpg");

c.buttonImportIcon("/C/Users/MyComputer/Desktop/Pictures/03.jpg");

d.buttonImportIcon("/C/Users/MyComputer/Desktop/Pictures/04.jpg");

e.buttonImportIcon("/C/Users/MyComputer/Desktop/Pictures/05.jpg");

f.buttonImportIcon("/C/Users/MyComputer/Desktop/Pictures/06.jpg");