fireing function with onChange

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I have a loop that is putting the filenames of files in a certain directory 
into a listbox.  I am then using the onChange event of the listbox to fire a 
function.  In this script the onchange event sends the function the path an 
filename of the chosen file from the list.  I have tested what I am sending 
with a javascript alert and it looks ok.  The funstion is supposed to open 
the file and then make a new file(im working with jpegs using GD).

Unfortunately it isnt working the way I would want it to.  Can soneone check 
this code and see if there is anything wrong.  In the browser it doesnt do 
anything.  I had hoped for at least an error code.

Hope someone can help...Thanks

<?php
  function createimage($picpath){
    $im = imagecreatefromjpeg($picpath);
    imagejpeg($im,"images/temp.jpg");
  }
  $path = "images";
  $dir_handle = @opendir($path) or die("Unable to open $path");
  echo "<select name='filelist' size='14' multiple 
onchange=createimage('$path/'+this.options[this.selectedIndex].value)>\n";
  while ($file = readdir($dir_handle))
    {
      if($file!="." && $file!=".."){
        echo "<option value='$file'>$file</option><br/>\n";
      }
    }
  echo "</select>\n";
  echo "<img border='0' src='images/temp.jpg' width='300' height='224'>";
?> 

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