[Javascript] Problème rechargement iframe

echo "<img src=\"directory.png\" onclick=\"plidepli('".str_replace($replace,"",$str)."')\">  <input type='button' class= 'repertoire' value= '". $str2 ."'  onclick= \"parent.frames['\"/contenu.php?path=.'". $tableau ."'\"'].location.reload()\" ><BR>"; 

echo "<img src=\"directory.png\" onclick=\"plidepli('".str_replace($replace,"",$str)."')\">  <input type='button' class= 'repertoire' value= '". $str2 ."'  onclick= \"parent.frames['/contenu.php?path=". $tableau ."'].location.reload()\" ><BR>"; 

onclick= \"parent.frames['nom_de_iframe'].location.href('contenu.php?path=". $tableau ."')\"

<iframe src="Contenu.php" id="Contenu" name="Contenu" height="800" width=700> 

onclick= \"document.getElementById('Contenu').location.href('contenu.php?path=". $tableau ."')\"

<div id="contenu" .... > TON CODE PHP CHARGE DE MONTRER LE CONTENU </div>

<script language="javascript">
function callScript ( scriptName, args ){
	
	var xhr_object = null; 
	     
	if(window.XMLHttpRequest) // Firefox 
	   xhr_object = new XMLHttpRequest(); 
	else if(window.ActiveXObject) // Internet Explorer 
	   xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
	else { // XMLHttpRequest non supporté par le navigateur 
	   alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
     return; 
	} 
	 
	xhr_object.open("POST", scriptName, true);
	     
	xhr_object.onreadystatechange = function() { 
	   if(xhr_object.readyState == 4) {
			//alert(xhr_object.responseText); // DEBUG MODE
			//document.write(xhr_object.responseText);
			eval(xhr_object.responseText);
		 }
		
		//alert(xhr_object.readyState);
		return xhr_object.readyState;
	} 
	 
	xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	
	xhr_object.send(args);

}
</script>

<?php

function listeFichier($chemin){
	$replace = array(":","/","\\"," ",".","(",")","_");
	$tableau = glob($chemin . '/*.*');

	$display = "";
  $display += "<table align ='center'>";

  foreach($tableau as $str){
    if (is_file($str)){
       $tab = explode('/',$str);
       $nomFichier = '';

       foreach ($tab as $tabs){
          $nomFichier = $tabs;
       }

       $extension = explode('.',$str);
       $extension = $extension[count($extension)-1];
       $extension = strtoupper($extension);

       $display += "<td><tr>".$nomFichier."</tr><tr>".$extension. "</tr></td>";
    }
	}

	if(count($tableau) == 0)
		$display += "<td><tr align ='center'>Ce repertoire est vide</tr></td>";
		
	
	$display += "</table>";

	// --- Finally return the string to display
	return $display;
}



$path = isset($_GET['path']) ? $_GET['path'] : '';

$toDisplay = "";
if ($path != ''){
	$toDisplay = listeFichier($Path);
}
else{
  $toDisplay = "Rien à afficher";
}

// --- Update the content of DIV 'contenu'
echo "var div = document.getElementById('contenu');";
echo "div.innerHTML = ".$toDisplay.";";

?> 

  onclick= \"callScript('traitement.php','path='".$tableau."')\"

//alert(xhr_object.responseText); // DEBUG MODE