字段div弹出层(垂直与横向居中)兼容ie和ff

下面是整个页面的代码,总共分为CSS和Javascript和HTML三部份复制后运行就可以了里面有个背景图要自己换掉。

#alertdiv{position:absolute;height:450px;width:400px;z-index:9999; left:50%;margin-left:-200px;padding:1 px;border:1 px#ccc sol id; font-size:12px;display:none;background-color:#FFFFFF}

#alertdiv h2{position:relative; height:23px;background-color:#E4E4E4;font-size:12px;padding:0;padding-left:5px; l ine-height:23px;margin:0; }

#alertdiv h2 a{position:absolute;display:block;right:5px; top:3px;display:block;margin:0;width:16px;height:16px;margin:0;padding:0;overflow:hidden;backgrou nd:u rl(images/icon/action_delete.gif) no-repeat;cursor:pointer; text-indent:-999px}

.forminfo{padding:5px;}

. inputR{width:120px;}

.bg{background-color:#CCC;-moz-opacity:0.5; fi lter:alpha(opacity=50);height:10000px;width:120%;position:absolute;z-index:9998; left:0; top:0;display:none}function alertinfo(id){

//显示弹出层var obj=document.getElementById(id);var W=screen.width;//取得屏幕分辨率宽度var H=screen.height;//取得屏幕分辨率高度var yScrol l ;//取滚动条高度if (se lf.p a geYOffs et) {yScrol l=self.pageYOffset;

}else if (document.documentElement&&document.documentElement.scrollTop){yScrol l=document.documentElement.scrol lTop;

}else if (document.body) {yScrol l=document.body.scrollTop;

}

//obj.style.marginL eft=(W/2-200)+"px";obj.style.top=(H/2-90-225 + yScrol l)+"px";document.getElementById("bg").style.display="block";obj.style.display="block";var scrollstyle=scrolls();scrol lstyle.style.overflowX="hidden";scrol lstyle.style.overflowY="hidden";

}function closediv(id){

//关闭弹出层

document.getElementById(id).style.display="none";document.getElementById("bg").style.display="none";var scrollstyle=scrolls();scrol lstyle.style.overflowY="auto";scrol lstyle.style.overflowX="hidden";

}function scrol ls(){

//取浏览器类型var temp_h1 =document.body.cl ientHeight;var temp_h2=document.documentElement.cl ientHeight;var isXhtml=(temp_h2<=temp_h1&&temp_h2!=0)?true:false;var htmlbody=isXhtml?document.documentElement:document.body;return htmlbody;

}

<div class="bg" id="bg"></div>

<div id="alertdiv">

<h2>请填写表单信息<a href="javascript:closediv('alertdiv')" title="关闭">关闭</a></h2><div class="forminfo">

<table width="100%"border="0"al ign="center"cel lpadding="5">

<form id="form1"name="form1"method="post"action="">

<tr>

<td width="21%"al ign="right">字段一 </td>

<td width="41%"><input type="text"name="textfield" id="textfield"class="inputR"/></td><td width="38%">&nbsp;</td>

</tr>

<tr>

<td al ign="right">字段三 </td>

<td><input type="text"name="textfield2" id="textfield2"class="inputR"/></td>

<td>&nbsp;</td>

</tr>

<tr>

<td al ign="right">字段四 </td>

<td><input type="text"name="textfield3" id="textfield3"class="inputR"/></td><td>&nbsp;</td>

</tr>

<tr>

<td al ign="right">字段五 </td>

<td><input type="text"name="textfield4" id="textfield4"class="inputR"/></td><td>&nbsp;</td>

</tr>

<tr>

<td al ign="right">&nbsp;</td>

<td colspan="2"><label><input type="submit"name="button" id="button"value="提交" /></label>

<label><input type="reset"name="button2" id="button2"value="重置" /></label></td></tr>

</fo r m>

</table>

</div>

</div>

<p>&nbsp;</p>

<p>&nbsp;</p>

<p>&nbsp;</p>

<p>&nbsp;</p>

<p>&nbsp;</p>

<p>&nbsp;</p>

<p>;&nbsp;</p>

<p>&nbsp;</p>

<p><a href="javascript:alertinfo('alertdiv');">显示弹出层</a></p>