LayerSlider WP customization: change random order dynamically

hi, i have a layerslider in home page (two version, one for english site and another for italian site) with this event callback: function( event ) { var d = new Date(); var n = [login to view URL](); [login to view URL]('oggi ne abbiamo: ' + n ); /* n = 8; */ if( n > 7 ){ var $j = jQuery; var i = 1; var $s = $j( '#layerslider_'+i ); $[login to view URL]( 'div.ls-slide:first' ).remove(); } } This custom code hide the first slide after the seventh day of the month. Now i need to add another feature regard the order: - first seven day of the month: at the begin the slider have to load the first slider as now but after the first slide order have to change in random. - from eighth day of the month: at the begin first slide have to be hidden as now and contemporary order have to be random.