Google Maps API: Get url for current view

I have a form where users can introduce google maps urls to specify the address of some stuff. I've been thinking in showing a map through Google Map API v3, letting user move to desired location and through a button or something automatically get the url of the place and copy it to an input.

I've been able to display the map using the tutorial, but I haven't been able to find in the documentation how I could get the url...

I think you will not need it, but this is the simple code I'm using:

var latlng = new google.maps.LatLng(-34.397, 150.644);
var options = {
zoom: 8,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: false
var map = new google.maps.Map(document.getElementById('map-box'), options );

I'd suggest using map.getCenter().toUrlValue() and map.getZoom() to obtain the centre and zoom state of the current map view. That information should let you build a URI that you can then use, bare in mind that you'll need to write some code to take the values off the URI and pass them to the map API.