Code to use Div to imitate the effect of showModalDialog mode menu_javascript skills

Today I studied a small example of using javascript combined with p to create the current form display mode form and make the subform inoperable!
I referenced this effect by referring to the individual effects on the website. Come on, his is more complicated because it combines some other functions. Here I will briefly summarize the principles of this effect:
Step 1: Define a p floating layer that floats above the base layer, which is displayed by default. The mode is hidden, and the relevant code is as follows:

<p id="buySelName" class="modalp" style="position:absolute;left:300px; top:140px;z-index:2;display:none;"> 
</p>

Step 2: Define a floating p object containing an iframe, with width and height of 100%, background color as white, and alpha transparency set to 50 %, the main function can show better results;

<p id="disablep" style="position:absolute; left:0px; top:0px; width:100%; height:100%; z-index:1; background-color:#000000; border: 0px none #000000; FILTER:alpha(opacity=50);display:none;";><iframe src="about:blank" name="hiddenIframe" width="100%" height="100%"></iframe></p>

Step 3: Make output content p:

<p id="objText" style="display:none;"> 
<p class="modalheader"> 
  <p class="header"> 
   <p class="mleft"> 
    <p class="boxheader-text"><span class="b">显示窗体</span></p> 
   </p> 
   <p class="btnright"><a href="javascript:ShowModal(&#39;buy&#39;);"><img src="close.gif" alt="关闭" /></a></p> 
  </p> 
</p> 
<p class="modalbody"> 
  希望能大家多多交流! 
</p> 
</p>

Step 4: Write related javascript:

<SCRIPT LANGUAGE="JavaScript"> 
<!-- 
function ShowModal(dname) 
{ 
  var buyp=document.getElementById(dname+&#39;SelName&#39;); 
  var objp=document.getElementById(&#39;objText&#39;); 
  var disable=document.getElementById(&#39;disablep&#39;); 
  if(buyp.style.display==&#39;none&#39;) 
  { 
   buyp.style.display=&#39;block&#39;; 
   disable.style.display=&#39;block&#39;; 
   buyp.innerHTML=objp.innerHTML; 
  }else{ 
   buyp.style.display=&#39;none&#39;; 
   disable.style.display=&#39;none&#39;; 
  } 
} 
//--> 
</SCRIPT>