string str =
    "<script language=\"JavaScript\"><!--{OsCommon}\n"
    + "    function OsOnlyNumericKey() {\n"
    + "        return ( event.keyCode>=48 && event.keyCode<=57 || event.keyCode==8 || event.keyCode==13 );\n"
    + "    }\n"
    + "    --></script>\n";