Bizzare form problem - Please Help!

Sorry if this is a repost, I could not see the original. Any help with this would be immensely appreciated! Here is what the problem I am having is: I have a .php page. There are several form fields. When I populate the fields, submit to another page, and then use the browser's back button, the data is still there. This is indeed what I want. HOWEVER, when one field has a javascript event (ie. onClick open a browser window) when I submit the form, and try to go back, the data is gone :( If I use the exact same page without a php extension, things are still fine. Unfortunately I need this to be a PHP as I will be linking dynamic data to drop down lists. This seems bizarre to me. Following is a very simple sample. Served as an .html file it is just fine, served as a .php file the form data is lost on a back click. Thanks for any help! Code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Untitled Document</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <script language="JavaScript" type="text/JavaScript"> <!-- function openBrWindow(theURL,winName,features) { //v2.0 window.open(theURL,winName,features); } //--> </script> </head> <body> <form name="form1" id="form1" method="post" action="http://www.cnn.com"> <table width="400" border="1"> <tr> <td width="92">One</td> <td width="292"> <input name="textfield1" type="text" id="textfield1" /> </td> </tr> <tr> <td>Two</td> <td><input name="textfield2" type="text" id="textfield2" /></td> </tr> <tr> <td>Three</td> <td><input name="textfield3" type="text" id="textfield3" onclick="openBrWindow('http://www.cnn.com','','width=50,height=50')" /></td> </tr> <tr> <td>&nbsp;</td> <td><input type="submit" name="Submit" value="Submit" /></td> </tr> </table> </form> <p>&nbsp;</p> </body> </html>