diaporama conflit setTimeout et on click

<script type="text/javascript">

ejs_photo = new Array;

<?
$a = 0;
$handle = opendir("diaporama/chevrerie"); 
while (($file = readdir())!=false) { 
	clearstatcache(); 
	if($file!=".." && $file!=".") 
		{
		$nom[$compt] = "$file";
		$compt++;
		$a++;
		}
	}
if ($compt > 0 )  sort($nom);
for($i=0;$i < $compt;$i++) 
     { 
        echo "ejs_photo[$i] = 'diaporama/chevrerie/$nom[$i]';";
     } 

echo "var nbr_photo = $a"; 	
	
closedir($handle); 
?>
	
function ejs_aff_photos(num)
{
if (num+1<nbr_photo)
 {	
 var obj = 'ejs_aff_photos('+(num+1)+')'; 
 }
else
 {
 var obj = 'ejs_aff_photos(0)';
 }
	
if(document.getElementById)
{
 ejs_fin = "";
  if(num!=0)
   ejs_fin += "<A HREF=# onClick='ejs_aff_photos("+(num-1)+");return(false)'><img src=\"http://www.yevrecapri.com/images/fleche_gauche.png\" ></A>";

  if(num!=(ejs_photo.length-1))
   ejs_fin += "<A HREF=# onClick='ejs_aff_photos("+(num+1)+");return(false)'><img src=\"http://www.yevrecapri.com/images/fleche_droite.png\" ></A>";
			
document.getElementById("ejs_photo_box").innerHTML = "<CENTER><IMG WIDTH='600' height='400' SRC='"+ejs_photo[num]+"' BORDER=1><BR><br>"+ejs_fin+"</CENTER>";

}
		
//var obj = "'ejs_aff_photos("+(num+1)+");return(false)'"; 

setTimeout(obj,3000); 	
}

window.onload = new Function("ejs_aff_photos(0)")

</script>