function loading(img){
		millisecondi = 10;
		document.getElementById('img_big').innerHTML = '<img src="' + img + '">';
	    var now = new Date();
	    var exitTime = now.getTime() + millisecondi;

	    while(true)
	    {
	        now = new Date();
	        if(now.getTime() > exitTime) return;
	    }
	}