Implimentation code is below:

<!-- code based on code from mozilla -->

<script type="text/javascript">
<!--
function errorMsg(name,ext,cat)
{
  // alert("Netscape 6 or Mozilla is needed to install a sherlock plugin");
  f=document.createElement("form");
  f.setAttribute("name","installform");
  f.setAttribute("method","post");
 
f.setAttribute("action","http://mycroft.mozdev.org/error.html");
  fe=document.createElement("input");
  fe.setAttribute("type","hidden");
  fe.setAttribute("name","name");
  fe.setAttribute("value",name);
  f.appendChild(fe);
  fe=document.createElement("input");
  fe.setAttribute("type","hidden");
  fe.setAttribute("name","ext");
  fe.setAttribute("value",ext);
  f.appendChild(fe);
  fe=document.createElement("input");
  fe.setAttribute("type","hidden");
  fe.setAttribute("name","cat");
  fe.setAttribute("value",cat);
  f.appendChild(fe);
 
document.getElementsByTagName("body")[0].appendChild(f);
  if (document.installform) { 
    document.installform.submit();
  } else {
   
location.href="http://mycroft.mozdev.org/error.html";
//hack for DOM-incompatible browsers
  }
}
function addEngine(name,ext,cat)
{
  if ((typeof window.sidebar == "object") &&
(typeof
  window.sidebar.addSearchEngine == "function"))
  {
    //cat="Web";
    //cat=prompt("In what category should this engine be installed?","Web")
    window.sidebar.addSearchEngine(
     
"http://clamwin.sourceforge.net/plugins/firefox_search/"+name+".src",
     
"http://clamwin.sourceforge.net/plugins/firefox_search/"+name+"."+ext,
      name,
      cat );
  }
  else
  {
    errorMsg(name,ext,cat);
  }
}
//-->
</script>

<a
href="javascript:addEngine('clamwin-search','png','Reference')">Clamwin
Firefox Search Engine</a>