var kkeys = [], konami = "38,38,40,40,37,39,37,39,66,65";
$(document).keydown(function(e) {
  kkeys.push( e.keyCode );
  if ( kkeys.toString().indexOf( konami ) >= 0 ){
    $(document).unbind('keydown',arguments.callee);
	var div = document.getElementById('contentM');
	var property = getTransformProperty(div);
	div.style[property] = 'rotate(180deg)';
	document.getElementById("hide").style.display = "block";
	document.getElementById("hide").style[property] = 'rotate(180deg)';
  }
});

function getTransformProperty(element) {
    var properties = [
        'transform',
        'WebkitTransform',
        'MozTransform',
        'msTransform',
        'OTransform'
    ];
    var p;
    while (p = properties.shift()) {
        if (typeof element.style[p] != 'undefined') {
            return p;
        }
    }
    return false;
}