var mess = new Array(
'<img src="i/circle_1.png" width="18" height="17" alt="" title="" border="0" />',
'<img src="i/circle_2.png" width="18" height="17" alt="" title="" border="0" />',
'<img src="i/circle_3.png" width="18" height="17" alt="" title="" border="0" />',
'<img src="i/circle_4.png" width="18" height="17" alt="" title="" border="0" />',
'<img src="i/circle_5.png" width="18" height="17" alt="" title="" border="0" />',
'<img src="i/circle_6.png" width="18" height="17" alt="" title="" border="0" />',
'<img src="i/circle_7.png" width="18" height="17" alt="" title="" border="0" />',
'<img src="i/circle_8.png" width="18" height="17" alt="" title="" border="0" />');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);