Function random :)

	function randomString(length) {
	    var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz'.split('');
	    if (! length) {
	        length = Math.floor(Math.random() * chars.length);
	    }
	    var str = '';
	    for (var i = 0; i < length; i++) {
	        str += chars[Math.floor(Math.random() * chars.length)];
	    }
	    return str;
	}
	var div = randomString(8);
	alert(div);