function copyToClipboard(txt) {
var txt=document.getElementById(txt).value;
     if(window.clipboardData) {
             window.clipboardData.clearData();
             window.clipboardData.setData("Text", txt);
     } else if(navigator.userAgent.indexOf("Opera") != -1) {
          window.location = txt;
     } else if (window.netscape) {
          try {
               netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
          } catch (e) {
               alert("被浏览器拒绝！\n请在浏览器地址栏输入'about:config'并回车\n然后将'signed.applets.codebase_principal_support'设置为'true'");
          }
          var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
          if (!clip)
               return;
          var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
          if (!trans)
               return;
          trans.addDataFlavor('text/unicode');
          var str = new Object();
          var len = new Object();
          var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);
          var copytext = txt;
          str.data = copytext;
          trans.setTransferData("text/unicode",str,copytext.length*2);
          var clipid = Components.interfaces.nsIClipboard;
          if (!clip)
               return false;
          clip.setData(trans,null,clipid.kGlobalClipboard);
          alert("复制成功！")
     }
}
function disp(obj){
var obj=document.getElementById(obj);
obj.style.display="block";
}
function clos(obj){
var obj=document.getElementById(obj);
obj.style.display="none";
}

function show_tab(num){
	document.getElementById("dv_tab").className = "n"+num;
}

/** 下列所有代码只适应标准模式页面 **/

function fnShowMask() {  //显示遮罩层
	var o = document.getElementById('dv_mask');
	o.style.width = document.body.scrollWidth+'px';
	o.style.height = document.body.scrollHeight+'px';
	o.style.visibility = 'visible';
}

function fnHideMask() {  //隐藏遮罩层
	var o = document.getElementById('dv_mask');
	o.style.visibility = 'hidden';
}

function fnShowLayer(o) {  //显示指定层
	o = document.getElementById(o);
	var oMask = document.getElementById('dv_mask');
	var oRoot = document.documentElement;
	fnShowMask();
	o.style.top = (oRoot.clientHeight - o.clientHeight)/2 + oRoot.scrollTop +'px';
	o.style.left = (oRoot.clientWidth - o.clientWidth)/2 + oRoot.scrollLeft +'px';
	//o.style.visibility = 'visible';
	//o.style.zIndex = '100';
	oMask.onclick = function() {
		fnHideLayer('dv_layer');
		return false;
	}
}

function fnHideLayer(o) {  //隐藏指定层
	o = document.getElementById(o);
	fnHideMask();
	o.style.top = '-900px';
}


function fnSwitchLayer(o) {  //隐藏指定层
	o = document.getElementById(o);
	if (o.style.visibility && o.style.visibility == 'visible') {
		o.style.visibility = 'hidden';
	} else if (o.style.visibility && o.style.visibility == 'hidden') {
		o.style.visibility = 'visible';
	}
}