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具有浏览器检测功能的登录页面模板

<html><head><title>石家庄商务礼品</title><script language="javascript">var sUagent=navigator.userAgent;var fAVersion=parseFloat(navigator.appVersion);var isOpera=sUagent.indexOf("Opera") > -1;var isIE=sUagent.indexOf("compatible") > -1 && sUagent.indexOf("MSIE") > -1 && !isOpera;var isIE4=isIE5=isIE5_5=isIE6=false;if (isIE){  var reIE=new RegExp("MSIE (\\d+\\.\\d+);");  reIE.test(sUagent);  var getIEVersion=parseFloat(RegExp["$1"]);  isIE4 = getIEVersion >= 4;  isIE5 = getIEVersion >= 5;  isIE5_5 = getIEVersion >= 5.5;  isIE6 = getIEVersion >= 6;  }window.onload=function () { if (isIE6){   document.getElementById("divLogin").style.visibility = "visible";   document.getElementById("divError").style.visibility = "hidden"; }};</script></head><body><form name="form1"><div style="border:2px dashed blue; background-color:#cccccc; height:160px; padding:10px">  <div id="divError" style="position:absolute;left:20px;top:80px">    此应用程序运行要求如下:    <ul>       <li>Internet Explorer 6.0 以上版本</li>    </ul>    <noscript>      <p>您的系统设置不支持JavaScript,请重新设置!</p>    </noscript>  </div>  <div id="divLogin" style="position:absolute; left:200px; top:80px; visibility:hidden"><table width="450" border="0" align="center" cellpadding="0" cellspacing="0">  <tr>    <td height="115" background="/jscss/demoimg/201405/lg_top.jpg">&nbsp;</td>  </tr>  <tr>    <td background="/jscss/demoimg/201405/lg_bg.jpg"><table width="300" border="0" align="center" cellpadding="5" cellspacing="0">          <tr>            <td height="22" align="right">管理员:</td>            <td height="22"><input name="txt_name" type="text" class="textbox" id="txt_name" size="18" maxlength="50"></td>          </tr>          <tr>            <td height="22" align="right">密              码:</td>            <td height="22"><input name="txt_passwd" type="password" class="textbox" id="txt_passwd" size="19" maxlength="50"></td>          </tr>          <tr>            <td height="22" colspan="2" align="center"><input name="login" type="submit" id="login" value="登 录" class="button" onClick="return Mycheck()">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;              <input type="reset" name="Submit2" value="重 置" class="button"></td>          </tr>    </table></td>  </tr>  <tr>    <td height="59" background="/jscss/demoimg/201405/lg_bot.jpg">&nbsp;</td>  </tr></table>  </div></div></form></body></html>