function convertMath(node) {// for Gecko
  if (node.nodeType==1) {
    var newnode = 
      document.createElementNS("http://www.w3.org/1998/Math/MathML",
        node.nodeName.toLowerCase());
    for(var i=0; i < node.attributes.length; i++)
      newnode.setAttribute(node.attributes[i].nodeName,
        node.attributes[i].nodeValue);
    for (var i=0; i<node.childNodes.length; i++) {
      var st = node.childNodes[i].nodeValue;
      if (st==null || st.slice(0,1)!=" " && st.slice(0,1)!="\n") 
        newnode.appendChild(convertMath(node.childNodes[i]));
    }
    return newnode;
  }
  else return node;
}
function convert() {
  var mmlnode = document.getElementsByTagName("math");
  var st,str,node,newnode;
  for (var i=0; i<mmlnode.length; i++)
    if (document.createElementNS!=null)
      mmlnode[i].parentNode.replaceChild(convertMath(mmlnode[i]),mmlnode[i]);
    else { // convert for IE
      str = "";
      node = mmlnode[i];
      while (node.nodeName!="/MATH") {
        st = node.nodeName.toLowerCase();
        if (st=="#text") str += node.nodeValue;
        else {
          str += (st.slice(0,1)=="/" ? "</m:"+st.slice(1) : "<m:"+st);
          if (st.slice(0,1)!="/") 
             for(var j=0; j < node.attributes.length; j++)
               if (node.attributes[j].nodeValue!="italic" &&
                 node.attributes[j].nodeValue!="" &&
                 node.attributes[j].nodeValue!="inherit" &&
                 node.attributes[j].nodeValue!=undefined)
                 str += " "+node.attributes[j].nodeName+"="+
                     "\""+node.attributes[j].nodeValue+"\"";
          str += ">";
        }
        node = node.nextSibling;
        node.parentNode.removeChild(node.previousSibling);
      }
      str += "</m:math>";
      newnode = document.createElement("span");
      node.parentNode.replaceChild(newnode,node);
      newnode.innerHTML = str;
    }
}