function randInt(min,max)
{
     var div = (max - min) + 1
     var randNum = Math.random()
     for (var i = 0; i <= div - 1; i++)
     {
          if (randNum >= i / div && randNum < (i+1) / div)
          {return i + min}
     }
}

var abc = randInt(1,2);
if (abc == 1) {
     document.write(" <img src=\"images/banner1.gif\" width=\"730\" height=\"150\" alt=\"MDAO Branch Banner\" border=\"0\" align=\"bottom\" /> ");
}

if (abc == 2) {
     document.write(" <img src=\"images/banner2.gif\" width=\"730\" height=\"150\" alt=\"MDAO Branch Banner\" border=\"0\" align=\"bottom\" /> ");
}