// Place your application-specific JavaScript functions and classes here
// This file is automatically included by javascript_include_tag :defaults
function MM_openBrWindow(theURL,winName,features)
{
    window.open(theURL,winName,features);
}

function dist_between(lat1, lon1, lat2, lon2)
{
    var R = 6371; // km
    var dLat = (lat2 - lat1).toRad();
    var dLon = (lon2 - lon1).toRad(); 
    var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
        Math.cos(lat1.toRad()) * Math.cos(lat2.toRad()) * 
        Math.sin(dLon/2) * Math.sin(dLon/2); 
    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
    var d = R * c;

    return (d);
}