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 //open dier
  $dir=opendir("Demo/ads/");

//get each file and exclude some stuffs
 while($file=readdir($dir))
 {
  if($file!="."&&$file!="..")
  {
 $stringarray = $stringarray.$file. " ";

  }//end of if
 }//end of while($file=readdir($dir))

 //convert string "array" into "real array"
$filearray = explode(" ",$stringarray);
$count = count($filearray)-2;

 //create random number
 $rand=rand(0,$count);

 //show an add
 echo "
<a href='adgo.php?ad=$filearray[$rand]'><img src='Demo/ads/$filearray[$rand]' border=0></a>
 ";
//Html Code Start Here
<p>Please Wait... <!--<meta http-equiv='refresh' content='3'> -->
<a href="">Click Here To Refresh Page</a>


Index.php


$ad=$_GET['ad'];

switch($ad)
{
  case "ad1.gif";
  header ("Location: http://www.google.co.in");
  break;
  
  case "ad2.gif";
  header ("Location: http://www.yahoo.com");
  break;

}//end of switch