Distance between two coordinates

gistfile1.js

function distanceBetween( point1, point2 ) {
    var xs = 0;
    var ys = 0;
     
    xs = point2.x - point1.x;
    xs = xs * xs;
     
    ys = point2.y - point1.y;
    ys = ys * ys;
     
    return Math.sqrt( xs + ys );
}