$(document).ready(function(){
    $('#mylink').click(function(){
       if ($('.findaddress').css('display') == 'none')
       {
            $('.findaddress').show('slow');
            $(this).html('<img src="http://www.foodland.gr/images/directionsoff.gif" />');
       }
       else
       {
            $('.findaddress').hide('slow');
            $(this).html('<img src="http://www.foodland.gr/images/directionson.gif" />');
       }
       return false;
    });
});