[Jlamepok]

function PopUp(url, name, width, height, center, resize, scroll, posleft, postop) {
    					if (posleft != 0) { x = posleft }
    					if (postop  != 0) { y = postop  }
    					if (!scroll) { scroll = 1 }
    					if (!resize) { resize = 1 }
    					if ((parseInt (navigator.appVersion) >= 4 ) && (center)) {
      						X = (screen.width  - width ) / 2;
      						Y = (screen.height - height) / 2;
    					}
	    				if (scroll != 0) { scroll = 1 }
							var Win = window.open( url, name, 'width='+width+',height='+height+',top='+Y+',left='+X+',resizable='+resize+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no');
						}
			</script>
<form name='FORM' method='post' action='1234'> 
<textarea name='NAME'></textarea>
<a href="javascript:void(0);" onclick="PopUp('?uploadimg','Uploadimg','400','100','0','0','0','0');">
</form>

в функции "?uploadimg", после move_uploaded_file *** :

<script language='javascript'>
<!--
	function add_code(code)
	{
           opener.document.FORM.NAME.value += ' ' + code + ' ';
           window.close();
	}
//-->
</script>

echo "<script language='javascript'>add_code('$code')</script>";