/**
 * Detects if two elements are colliding
 *
 * Credit goes to BC on Stack Overflow, cleaned up a little bit
 *
 * @link http://stackoverflow.com/questions/5419134/how-to-detect-if-two-divs-touch-with-jquery
 * @param $div1
 * @param $div2
 * @returns {boolean}
 */
var is_colliding = function( $div1, $div2 ) {
	var x1 = $div1.offset().left,
		y1 = $div1.offset().top,
		h1 = $div1.outerHeight(true ),
		w1 = $div1.outerWidth(true ),
		b1 = y1 + h1,
		r1 = x1 + w1,
		x2 = $div2.offset().left,
		y2 = $div2.offset().top,
		h2 = $div2.outerHeight(true ),
		w2 = $div2.outerWidth(true ),
		b2 = y2 + h2,
		r2 = x2 + w2;

	if( b1 < y2 || y1 > b2 || r1 < x2 || x1 > r2 ) {
		return false;
	}

	return true;
};