Script needed

Download the Adobe LiveCycle Designer Scripting Basics Manual. There are several good scripts in the last chapter titled - Examples of Common Scripting Tasks.

This is one from, Page 104 that could solve your problem.

Scripting for adding a blue border around a selected field

To add the blue border around the selected field, add the following scripts to each text field:

For example, add an enter event to the Name field:
Name.border.edge.color.value = "0,0,255";

For example, add an exit event to the Name field:
Name.border.edge.color.value = "255,255,255";For example, add a mouseEnter event to the Name field:
Name.border.edge.color.value = "0,0,255";

For example, add a mouseExit event to the Name field:
Name.border.edge.color.value = "255,255,255";

Thanks very much for your help!
This which I really prefer is to change the button's font colour no the border or anything else!
I have set Button's borders edges and background fill to NONE.
Is it possible?

THANKS

I'm guessing the objective of this is to determine if someone has clicked the button. I don't believe you can change the buttons font but I know you can change the buttons fill color.

If this will work for you, here's the JavaScript for a button (MouseUp, MouseDown, or click) action:

Button1.fillColor = "150,130,33"

Note: You can have more than one JavaScript for a form element.