var textnumber = 3 ; 
var randomnumber = Math.random() ; 
var rand1 = Math.round( (textnumber-1) * randomnumber) + 1 ; 
text = new Array 
text[1] = "<br><img src='images/banner1.gif' height='60' width='486' border='0'>" 
text[2] = "<br><img src='images/banner2.gif' height='60' width='486' border='0'>" 
text[3] = "<br><img src='images/banner3.gif' height='60' width='486' border='0'>"
var rotate = text[rand1]