rsync -v --archive --update --delete --compress --rsh=ssh dreeves@boston.eecs.umich.edu:www/whiteboard /cygdrive/d/www

<?php
//$dir=$_GET['dir']; //GET is not working for some reason - hard code it
$dir='random';
$root=$_SERVER['DOCUMENT_ROOT'];
if ($handle = opendir("$root/images/$dir")) {
//echo $handle;
  /* This is the correct way to loop over the directory. */
 $i=0;
  while (false !== ($file = readdir($handle))) {
    if ($file != "." && $file != ".." && $file != "index.php") {
      $background[$i]=$file;
      $i++;
    }
  }
  sort($background);
} else {
  die("could not open directory");
}
$backgroundFile="background.txt";

function check_number($backgroundFile, $background)
{
  $random_number= rand(0,count($background)-1);
  //echo $random_number;
  $backgroundNumber=get_old_background($backgroundFile);
//echo "bnumber=$backgroundNumber";
  if ($backgroundNumber==$random_number) {
    if ($random_number > 0) {
      $random_number--;
    } if ($random_number==0) {
      $random_number++;
    }
  }
 // echo "rannum=$random_number";
  return $random_number;
}
function get_old_background($backgroundFile)
{
$handle=fopen($backgroundFile,'r');
$backgroundNumber=fread($handle, filesize($backgroundFile));
fclose($handle);
return $backgroundNumber;
}
$random_number=check_number($backgroundFile, $background);
echo "background:url(/images/$dir/$background[$random_number]);";
$handle1=fopen($backgroundFile,'w');
fwrite($handle1, $random_number);
fclose($handle1);
?>