$(document).ready(function(){

	var speed = 500;	
	$('#demo').masonry({
    	columnWidth: 235,
    	resizeable: true, 	
        itemSelector: '.box:not(.invis)',
        animate: true,
        animationOptions: {
    	    duration: speed,
    	    easing: 'linear',
    	    queue: false
    	  }		        
    });   

});