$(document).ready(function(){

    $('#zoom_01').on('click', function(){

        if( $('.enabled').length === 0){
            $('.zoomContainer').show();
            $('#zoom_01').elevateZoom({
            zoomType: "inner",
            cursor: "crosshair",
            zoomWindowFadeIn: 500,
            zoomWindowFadeOut: 750
           }); 
            $(this).toggleClass('enabled');
        }
        else{
            $(this).toggleClass('enabled');
            $('.zoomContainer').hide();
        }

   });
});