Object collision detection

gistfile1.js

// jQuery
function doObjectsCollide(a, b) { // a and b are your objects
    //console.log(a.offset().top,a.position().top, b.position().top, a.width(),a.height(), b.width(),b.height());
    var aTop = a.offset().top;
    var aLeft = a.offset().left;
    var bTop = b.offset().top;
    var bLeft = b.offset().left;

    return !(
        ((aTop + a.height()) < (bTop)) ||
        (aTop > (bTop + b.height())) ||
        ((aLeft + a.width()) < bLeft) ||
        (aLeft > (bLeft + b.width()))
    );
}

// kineticJS
function doObjectsCollide(a, b) { // a and b are your objects
   return !(
    ((a.getY() + a.getHeight()) < (b.getY())) ||
    (a.getY() > (b.y() + b.getHeight())) ||
    ((a.getX() + a.getWidth()) < b.getX()) ||
    (a.getX() > (b.getX() + b.getWidth()))
   );
}