How to change mouse pad on hp tx 2500

[rjtaylo76]

My mouse on my Hp tx 2500 jumps up and down irratically and only works part of the time, I have a spare touch pad and can replace it or is there something I can do to get it to work proper? or do I need to chande it? I am running windows 7

 

[buzznut]

Is it a laser mouse, or optical?