// JavaScript Document

var number;
number = Math.floor(Math.random()*4);
//number = 2;

<!--

function change1()
{

if (number==0)
document.write('<img src="http://www.dortonline.org/images/headers/header_b_1_top.jpg" width="340" height="61" alt="">')
if (number==1)
document.write('<img src="http://www.dortonline.org/images/headers/header_b_2_top.jpg" width="340" height="61" alt="">')
if (number==2)
document.write('<img src="http://www.dortonline.org/images/headers/header_b_3_top.jpg" width="340" height="61" alt="">')

if (number==3)
document.write('<img src="http://www.dortonline.org/images/headers/header_b_4_top.jpg" width="340" height="61" alt="">')
}

function change2()
{
if (number==0)
document.write('<img src="http://www.dortonline.org/images/headers/header_b_1_bottom.jpg" width="298" height="148" alt="">')
if (number==1)
document.write('<img src="http://www.dortonline.org/images/headers/header_b_2_bottom.jpg" width="298" height="148" alt="">')
if (number==2)
document.write('<img src="http://www.dortonline.org/images/headers/header_b_3_bottom.jpg" width="298" height="148" alt="">')
if (number==3)
document.write('<img src="http://www.dortonline.org/images/headers/header_b_4_bottom.jpg" width="298" height="148" alt="">')
}

//-->