//-------------------------------------------------------
// Centrer un élément verticalement sur la page ou par rapport a un élement
/* Usage ;  $('#mainDiv').center();
$(window).bind('resize', function() {
    $('#mainDiv').center({transition:300});
});
*/
//-------------------------------------------------------
(function($){
     $.fn.extend({
          center: function (options) {
               var options =  $.extend({ // Default values
                    inside:window, // element, center into window
                    transition: 0, // millisecond, transition time
                    minX:0, // pixel, minimum left element value
                    minY:0, // pixel, minimum top element value
                    vertical:true, // booleen, center vertical
                    withScrolling:true, // booleen, take care of element inside scrollTop when minX < 0 and window is small or when window is big
                    horizontal:true // booleen, center horizontal
               }, options);
               return this.each(function() {
                    var props = {position:'absolute'};
                    if (options.vertical) {
                         var top = ($(options.inside).height() - $(this).outerHeight()) / 2;
                         if (options.withScrolling) top += $(options.inside).scrollTop() || 0;
                         top = (top > options.minY ? top : options.minY);
                         $.extend(props, {top: top+'px'});
                    }
                    if (options.horizontal) {
                          var left = ($(options.inside).width() - $(this).outerWidth()) / 2;
                          if (options.withScrolling) left += $(options.inside).scrollLeft() || 0;
                          left = (left > options.minX ? left : options.minX);
                          $.extend(props, {left: left+'px'});
                    }
                    if (options.transition > 0) $(this).animate(props, options.transition);
                    else $(this).css(props);
                    return $(this);
               });
          }
     });
})(jQuery);

//---------------------------------------------------------
    function goTo(ancre){jQuery('html,body').animate({scrollTop:jQuery(ancre).offset().top},1000,'swing',function(){
//---------------------------------------------------------
            if(ancre != 'body')              window.location.hash = ancre;
            else         window.location.hash = '#';
            jQuery(ancre).attr('tabindex','-1');
            jQuery(ancre).focus();
            jQuery(ancre).removeAttr('tabindex');
        });
    }