<?php
if (empty($_GET['url'])) {
	echo '
	   <form action="" method="get" name="form1" class="right" id="form1">
  
      <div style="width:380px; float:left">
      <strong>URL:</strong>
      <input name="url" type="text" class="formus_url" id="url" value="" size="45"  />
      </div>
      <input type="image" src="images/check.png" name="button" id="button" value="Submit" style="float:right;" />
  
  </form>';
}
else {
	echo '<iframe style="z-index:1" src="', $_GET['url'], '" id="showframe" name="showframe" width = "1024px" height = "768px" align="center" scrolling="auto" frameborder="no" class="IFrames"></iframe>';
}
?>
Ama yeri burası değil sanırım.