Javascript submit does not work at times in chrome -

i have custom dialog box takes user input , submit form based on user input. javascript works fine on ie , firefox. works on chrome @ times @ times there no response.

<html>     <head>     <script type="text/javascript">          window.onblur = function() {          window.focus();          }          var realtimepolink = "./processabc.do";         var realtimepomethod = "startabc";         var nightlypolink = "./processxyz.do";         var nightlypomethod= "startxyz";            function startpo(){             var historyporadio = document.getelementbyid("nightlyporadio");             if(historyporadio !=null && historyporadio.checked == true){                 document.getelementbyid("method").value = nightlypomethod;                 document.getelementbyid("postartform").action = nightlypolink;             }             else{                 document.getelementbyid("method").value = realtimepomethod;                 document.getelementbyid("postartform").action = realtimepolink;             }             document.forms["postartform"].submit();             window.close();         }     </script>     </head>      <body>         <form name="postartform" id ="postartform" method="post" action="" target="assiamainwindow">             <input type="hidden" name="tn" value="0000010019">             <input type="hidden" name="portid" value="">             <input type="hidden" name="method" id="method" value="startpo">             <input type="hidden" name="confirmation" value="yes">              <table>                 <tr>                     <td>                         <input type="radio" name="posourcevalue" value="1" checked="checked">                     <td>abc                 </tr>                 <tr>                         <td>                         <input type="radio" name="posourcevalue" value="2">                     <td>mno                 </tr>                 <tr>                         <td>                         <input type="radio" name="posourcevalue" value="3" id="nightlyporadio">                     <td>xyz                 </tr>                 <tr>                     <td colspan="2" align="center">                         <input type="button" value="start" onclick="javascript:startpo();"/>                         <input type="button" value="cancel" onclick="javascript:window.close();"/>                 </tr>             </table>         </form>     </body> </html> 

irrespective of whether form submitted or not dialog box closed.