IP location w/ mapbox.js

iplocate.js

// Set default location in case the IP doesn't have one
var y = 40.8;
var x = -96.67;
	  
// Grab IP location from freegeoip API
$.getJSON('http://freegeoip.net/json/', function(json) {
  if (json) {
    y = json.latitude;
    x = json.longitude;
  }

// Build the map
var map = L.mapbox.map('map', 'landplanner.g7443phg', {
	scrollWheelZoom:false
}).setView([y, x], 9);

});