insert co-ordinates into database fields

Hello,
I am using this code in Javascript OnLoad event:
`if (navigator.geolocation) {

navigator.geolocation.getCurrentPosition(showPosition);

}

function showPosition(position) {

alert("Latitude: " + position.coords.latitude +

" Longitude: " + position.coords.longitude);

}`This works and the coordinates are shown in the dialog.
How do I insert the coords into database fields 'latitude' and 'longitude'?
Thanks
Pete