Useful javascript behaviour

page-behaviour.js

/*
* @param el is jquery element
*/
function adjustPosition(el){
    var $el = $(el);
    if (!$el.hasClass('adjusted')) {
        var _dataX = $el.data('position-x');
        var _dataY = $el.data('position-y');
        var positionX = _dataX ? _dataX + '%' : 'center';
        var positionY = _dataY ? _dataY + '%' : 'center';
        $el.css('background-position', positionX + ' ' + positionY);
        $el.addClass('adjusted');
    }
}