ciawalsh/iamME

(function($) {

$.fn.hoverpulse = function(options) {
    // in 1.3+ we can fix mistakes with the ready state
    if (this.length == 0) {
        if (!$.isReady && this.selector) {
            var s = this.selector, c = this.context;
            $(function() {
                $(s,c).hoverpulse(options);
            });
        }
        return this;
    }

    var opts = $.extend({}, $.fn.hoverpulse.defaults, options);

    // parent must be relatively positioned
    this.parent().css({ position: 'relative' });
    // pulsing element must be absolutely positioned
    this.css({ position: 'absolute', top: 0, left: 0 });

    this.each(function() {
        var $this = $(this);
        var w = $this.width(), h = $this.height();
        $this.data('hoverpulse.size', { w: parseInt(w), h: parseInt(h) });
    });

    // bind hover event for behavior
    return this.hover(
        // hover over
        function() {
            var $this = $(this);
            $this.parent().css('z-index', opts.zIndexActive);

            var size = $this.data('hoverpulse.size');
            var w = size.w, h = size.h;
            $this.stop().animate({
                top:  ('-'+opts.size+'px'),
                left: ('-'+opts.size+'px'),
                height: (h+2*opts.size)+'px',
                width:    (w+2*opts.size)+'px'
            }, opts.speed);
        },
        // hover out
        function() {
            var $this = $(this);
            var size = $this.data('hoverpulse.size');
            var w = size.w, h = size.h;

            $this.stop().animate({
                top:  0,
                left: 0,
                height: (h+'px'),
                width:    (w+'px')
            }, opts.speed, function() {
                $this.parent().css('z-index', opts.zIndexNormal);
            });
        }
    );
};

$.fn.hoverpulse.defaults = {
    size:  20,
    speed: 200,
    zIndexActive: 100,
    zIndexNormal: 1
};

})(jQuery);