var mess = new Array(
'<img src="images/img_header/1.jpg" width="540" height="80">',
'<img src="images/img_header/2.jpg" width="540" height="80">',
'<img src="images/img_header/3.jpg" width="540" height="80">',
'<img src="images/img_header/4.jpg" width="540" height="80">',
'<img src="images/img_header/5.jpg" width="540" height="80">',
'<img src="images/img_header/6.jpg" width="540" height="80">',
'<img src="images/img_header/7.jpg" width="540" height="80">',
'<img src="images/img_header/8.jpg" width="540" height="80">',
'<img src="images/img_header/9.jpg" width="540" height="80">',
'<img src="images/img_header/10.jpg" width="540" height="80">',
'<img src="images/img_header/11.jpg" width="540" height="80">',
'<img src="images/img_header/12.jpg" width="540" height="80">',
'<img src="images/img_header/13.jpg" width="540" height="80">',
'<img src="images/img_header/14.jpg" width="540" height="80">',
'<img src="images/img_header/15.jpg" width="540" height="80">');
var max = mess.length;
var num = Math.floor((Math.random() * max));