_Dopostback not happening on linkbutton on internet

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.NET

_Dopostback not happening on linkbutton on internet but its working on intranet

Pls help asap

Code is as follows

string strScript = "<script language='javascript'>";
                     strScript = strScript + "var parentid = eval('window.opener.Form1." + ViewState["TextId"] + "');";
                     strScript = strScript + "parentid.value ='" + HttpUtility.HtmlEncode(lblName.Text.ToString()).Replace("'", "") + "';";
                     if (lblHead.Text.ToString() == "Place_")
                     {
                         Session["PlaceCode"] = HttpUtility.HtmlEncode(lnkBtnCode.Text.ToString());
                     }

if (ViewState["FlexVal"].ToString() != null)
                       {
                           string strFlexVal = HttpUtility.HtmlEncode(ViewState["FlexVal"].ToString());
                           int intIndex = strFlexVal.IndexOf("lbl");
                           if (intIndex >= 0)
                           {
                               strScript = strScript + "var parentid2 = eval('window.opener.Form1." +HttpUtility.HtmlEncode(ViewState["FlexVal"].ToString()) + "');";
                               strScript = strScript + "parentid2.Text ='" + HttpUtility.HtmlEncode(lnkBtnCode.Text.ToString()) + "';";
                               Response.Write("FlexVal=" + HttpUtility.HtmlEncode(ViewState["FlexVal"].ToString()));
                           }
                           else
                           {
                               strScript = strScript + "var parentid2 = eval('window.opener.Form1." +HttpUtility.HtmlEncode(ViewState["FlexVal"].ToString()) + "');";
                               strScript = strScript + "parentid2.value ='" + HttpUtility.HtmlEncode(lnkBtnCode.Text.ToString()) + "';";
                               Response.Write("FlexVal=" + HttpUtility.HtmlEncode(ViewState["FlexVal"].ToString()));
                           }
                       }
                       else
                       {
                           Response.Write("FlexVal=Nothing");
                       }

if (lblHead.Text.ToString() == "Place_")
                      {
                          strScript = strScript + "window.opener.__doPostBack('LinkButton1','x');";
                      }

strScript = strScript + "window.close();";
                     strScript = strScript + "</script>";
                     Response.Write(strScript);