var imageArray = new Array();

imageArray[0] = "grfx/hdr/header1.jpg"; 
imageArray[1] = "grfx/hdr/header2.jpg";
imageArray[2] = "grfx/hdr/header3.jpg";
imageArray[3] = "grfx/hdr/header4.jpg";
imageArray[4] = "grfx/hdr/header5.jpg";
imageArray[5] = "grfx/hdr/header6.jpg";
imageArray[6] = "grfx/hdr/header7.jpg";
imageArray[7] = "grfx/hdr/header8.jpg";
imageArray[8] = "grfx/hdr/header9.jpg";
imageArray[9] = "grfx/hdr/header10.jpg";
imageArray[10] = "grfx/hdr/header11.jpg";
imageArray[11] = "grfx/hdr/header12.jpg";
function doIt()
{
var rand = Math.floor(Math.random()*12);

var imgPath = "<img src='"+imageArray[rand]+"' alt='' border='0' align='absmiddle' />";

document.getElementById("image").innerHTML = imgPath;

}// JavaScript Document