Rollover Text to Change Colour

Is there a way to make rollover text change colour like a hyperlink when the mouse or curser moves over it?  I've been doing the following:  Entering text in a text caption box, then copying and pasting that into a rollover text caption.  I change the colour of of the rollover text, then place a click box over that so that if you rollover the text it changes colour and if you click on it it will take you to the next slide.  However:  when I preview it it all works but the text is slightly off, so it changes colour but I can still see the original text slightly underneath…I'm not sure if this is a font problem, but I don't see why text that I've copied and pasted should lose it's kerning slightly.  Is there a different way to do this, and also is there a way to adjust kerning on just a few letters, as opposed to a whole word?  Option-right or left arrow seems to adjust the kerning of the whole word.  Any help would be appreciated!!