Hi, i'm having this problem in firefox (it works fine in IE). The error occurs in the popout window when i try to do a window.opener on the parent window. Error Console: window.opener.broadcast has no properties line 14. Code (markup): The error is on line 14: if (window.opener.broadcast.destination.value=="") Code (markup): Full code: <html> <head> <title>Untitled Document</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE"> <link href="../../HTML/eng/text.css" rel="stylesheet" type="text/css"> </head> <Script language="Javascript"> function adduser(ownername) { if (window.opener.broadcast.destination.value=="") { window.opener.broadcast.destination.value=ownername; } else { window.opener.broadcast.destination.value=window.opener.broadcast.destination.value+','+ownername; } return false; } </Script> <body bgcolor="#FFFFFF" text="#000000"> Add user into receiver: <br> <br> <table width="80%" border="0" cellpadding="3" cellspacing="1" bgcolor="#000000"> <tr bgcolor="#F2F2F2"> <td width="40%">User Name</td> <td>Action</td> </tr> <tr bgcolor="#FFFFFF"> <td> test </td> <td> <a onclick="adduser('test');return false;" href="#">Add</a></td> </tr> </table> <p><a href="adduser.php?&curpagenum=1">1</a> </p> </body> </html> Code (markup): I'm new to Javascript, would really appreciate any help. Thank you.