window.addEvent('domready', function()
{
	$$('.grayscale').each(function(e)
    {
        src = e.getProperty('src');
        e.setProperty('src',src + '&gray=1');
    });

    $$('.grayscale').addEvent('mouseover',function(e)
    {
        src = $(e.target).getProperty('src');
       $(e.target).setProperty('src',src.replace('&gray=1',''));
        });

            $$('.grayscale').addEvent('mouseleave',function(e)
    {
        src = $(e.target).getProperty('src');
       $(e.target).setProperty('src',src + '&gray=1');
        });
});