function get_random(maxNum)
{
  if (Math.random && Math.round)
  {
    var ranNum= Math.round(Math.random()*(maxNum-1));
    ranNum+=1;
    return ranNum;
  }
  else
  {
  today= new Date();
  hours= today.getHours();
  mins=   today.getMinutes();
  secn=  today.getSeconds();
  if (hours==19)
   hours=18;
  var ranNum= (((hours+1)*(mins+1)*secn)%maxNum)+1;
  return ranNum;
  }
}

function getaImage()
{
 var maxImages=8;
 var whichImage=get_random(maxImages);
 whichImage--;

var Image=new Array(maxImages)
   Image[00] = ["images/hdr_pic_01.jpg"];
   Image[01] = ["images/hdr_pic_02.jpg"];
   Image[02] = ["images/hdr_pic_03.jpg"];
   Image[03] = ["images/hdr_pic_04.jpg"];
   Image[04] = ["images/hdr_pic_05.jpg"];
   Image[05] = ["images/hdr_pic_06.jpg"];
   Image[06] = ["images/hdr_pic_07.jpg"];
   Image[07] = ["images/hdr_pic_08.jpg"];
   Image[08] = ["images/hdr_pic_09.jpg"];

//Insert Images
 document.write('<IMG SRC="' + Image[whichImage] + '"  WIDTH="650" HEIGHT="141">');
}

getaImage();