joomla消息提示，例如登录不成功时出现的账号错误提示，是以模块方式显示的。效果显示不是那么太美观，为了在不修改心文件的基础上实现弹出框 提示的效果。只有对模板稍微修改一下了。

1.打开默认模板文件的css文件，一般是tmplates.css,找到#system-message,如果没有则添加一个，插入属 性：display:none;

2.打开模板的index.php,找到<jdoc:include type=”message”/>先删掉，再把下面的代码粘贴到最下面也就是</body>的前面，

<?php if ($this->getBuffer(‘message’)){?>     
<jdoc:include  type="message" />      
<script type="text/javascript"  language="javascript">      
 var nhmessage =  document.getElementById("system-message").innerHTML;      
 sAlert(nhmessage,this);

function sAlert(txt){     
 //var  eSrc=(document.all)?window.event.srcElement:arguments[1];      
 var eSrc = window;      
 var shield =  document.createElement("DIV");      
 shield.id = "shield";      
 shield.style.position = "absolute";      
 shield.style.left =  "0px";      
 shield.style.top = "0px";      
 shield.style.width = "100%";      
 shield.style.height =  ((document.documentElement.clientHeight>document.documentElement.scrollHeight)?document.documentElement.clientHeight:document.documentElement.scrollHeight)+"px";       
 shield.style.background = "#333";      
 shield.style.textAlign = "center";      
 shield.style.zIndex =  "10000";      
 shield.style.filter = "alpha(opacity=0)";      
 shield.style.opacity = 0;      
 var alertFram =  document.createElement("DIV");      
 alertFram.id="alertFram";       
 alertFram.style.position = "absolute";      
 alertFram.style.left = "50%";      
 alertFram.style.top = "50%";       
 alertFram.style.marginLeft = "-225px" ;      
 alertFram.style.marginTop = -75+document.documentElement.scrollTop+"px";       
 alertFram.style.width = "450px";      
 alertFram.style.height = "150px";      
 alertFram.style.background = "#ccc";      
 alertFram.style.textAlign = "center";      
 alertFram.style.lineHeight = "150px";      
 alertFram.style.zIndex = "10001";      
 strHtml  = "<div  style=\"list-style:none;margin:0px;padding:0px;width:100%\">\n";       
 strHtml += "    <div  style=\"background:#658BB2;text-align:left;padding-left:10px;font-size:14px;font-weight:bold;height:25px;line-height:25px;border:1px  solid #336699;color:#fff;\">系统提示</div>\n";      
 strHtml += "    <div  style=\"background:#fff;text-align:center;font-size:12px;height:120px;line-height:120px;border-left:1px  solid #336699;border-right:1px solid #336699;\"><dl  id=\"system-message\"  style=\"display:inline;\">"+txt+"</dl></div>\n";      
 strHtml += "    <div  style=\"background:#fff;text-align:center;font-weight:bold;height:25px;line-height:25px;border:1px  solid #336699;border-top-width:0;\"><input type=\"button\"  value=\"确 定\" id=\"do_OK\" onclick=\"doOk()\" /></div>\n";       
 strHtml += "</div>\n";      
 alertFram.innerHTML =  strHtml;      
 document.body.appendChild(alertFram);      
 document.body.appendChild(shield);      
 this.setOpacity =  function(obj,opacity){      
 if(opacity>=1)opacity=opacity/100;      
 try{  obj.style.opacity=opacity; }catch(e){}      
 try{       
 if(obj.filters.length>0&&obj.filters("alpha")){      
 obj.filters("alpha").opacity=opacity*100;      
 }else{       
 obj.style.filter="alpha(opacity=\""+(opacity*100)+"\")";      
 }      
 }catch(e){}      
 }      
 var c = 0;       
 this.doAlpha = function(){      
 if (++c >  20){clearInterval(ad);return 0;}      
 setOpacity(shield,c);       
 }      
 var ad = setInterval("doAlpha()",1);      
 this.doOk = function(){      
 //alertFram.style.display =  "none";      
 //shield.style.display = "none";      
 document.body.removeChild(alertFram);      
 document.body.removeChild(shield);      
 eSrc.focus();      
 document.body.onselectstart = function(){return true;}      
 document.body.oncontextmenu = function(){return true;}      
 }       
 document.getElementById("do_OK").focus();      
 eSrc.blur();      
 document.body.onselectstart =  function(){return false;}      
 document.body.oncontextmenu =  function(){return false;}      
}      
 </script>       
<?php }?>

这样就可以实现弹出式效果,如果模板有<jdoc:include type="modules" name="debug" />，代码一定也要在它前面，否则弹出消息提示后，摁确定后，页面须重新刷新一下再可以用，不然鼠标不能点击 最后更新 ( 2010-05-30 17:17 )