I have a simple jQuery image switch that is failing.

$('.heart_img').click(function()
    {
        var heart_type = $(this).attr('src');

        //alert( heart_type );

        if ( heart_type == 'images/unheart.png')
        {
            //alert('uheart');
            $(this).attr('src','images/heart.png');
        }
        else if ( heart_type == 'images/heart.png');
        {
            $(this).attr('src','images/unheart.png');
        }

    });

The alerts fire correctly when not commented out so and the images are in the correct place so I am not sure what the problem is.