<?php
$folder = "http://www.s-kh.ru/listalki_fona/kompl_1";

$extList=array();
$extList['gif']='image/gif';
$extList['jpg']='image/jpeg';
$extList['jpeg']='image/jpeg';
$extList['png']='image/png';

$img = null;
if (substr($folder,-1) != '/') { $folder = $folder.'/';}
if (isset($_GET['img'])) {$imageInfo = pathinfo($_GET['img']);  if (isset( $extList[ strtolower( $imageInfo['extension'] ) ] ) &&
          file_exists( $folder.$imageInfo['basename'] ) ) {$img = $folder.$imageInfo['basename'];}} else {$fileList = array();
   $handle = opendir($folder);
   while ( false !== ( $file = readdir($handle) ) ) {$file_info = pathinfo($file);
if (isset( $extList[ strtolower( $file_info['extension'] ) ] )) {
     $fileList[] = $file;}}
closedir($handle);
  if (count($fileList) > 0) {$imageNumber = time() % count($fileList); $img = $folder.$fileList[$imageNumber];}}
if ($img!=null) {$imageInfo = pathinfo($img);  $contentType = 'Content-type: '.$extList[ $imageInfo['extension'] ];header ($contentType); readfile($img);}  
else {if ( function_exists('imagecreate') ) {header ("Content-type: image/png");
$im = @imagecreate (100, 100) or die ("Cannot initialize new GD image stream");
    $background_color = imagecolorallocate ($im, 255, 255, 255);
    $text_color = imagecolorallocate ($im, 0,0,0);
    imagestring ($im, 2, 5, 5,  "IMAGE ERROR", $text_color);
    imagepng ($im);
    imagedestroy($im);}}?>

body.replaceBody{background:transparent url(/_source/rnd.jpg) no-repeat 50% 50% fixed;
-moz-background-size:cover;
-o-background-size:102% auto;
-webkit-background-size:102% auto;
-khtml-background-size:cover;
background-size:cover;
overflow:hidden;
}
body.replaceBody table,body.replaceBody table td{text-align:center;vertical-align:middle;width:100%;height:90%;}
body.replaceBody table.replaceTable{width:500px;height:150px;margin:0 auto;border:4px double #F0F;background:#FCF;border-collapse:separate;border-spacing:5px;}
body.replaceBody table.replaceTable td{border:4px double #00F; background: #baeafe;}