Add GeoLocation Button To Custom Google Map API V3

I have created a custom code I am using for google maps api v3. I simply want to add a button where if it is clicked it will show the geolocation of the person. I attached the basic code i need the button added to The code is very basic and the feature is also basic just having issue adding the click event. look at this sample [login to view URL] When the center button is clicked I actually want it to do this instead [login to view URL] this will trigger the geolocation. It needs to work with my code so people can search or use the geolocation button but it must always show the KML file on google map.