$(function() {
    jQuery.highlight = document.body.createTextRange ?

    /*
    Version for IE using TextRanges.
    */
  function(node, te) {
	var tipo = (typeof te); 
	if(tipo == "string")
	{
			var r = document.body.createTextRange();
			r.moveToElementText(node);
			for (var i = 0; r.findText(te); i++) {
			  r.pasteHTML('<span class="highlight">' + r.text + '<\/span>');
			  r.collapse(false);
			 } 
	}
	else
	{ 
		
		for(var j = 0; j < te.length; j++)
		{
			var r = document.body.createTextRange();
			r.moveToElementText(node);
			for (var i = 0; r.findText(te[j]); i++) {
			  r.pasteHTML('<span class="highlight">' + r.text + '<\/span>');
			  r.collapse(false);
			}	
		}
	}
  }

 :

    /*
    (Complicated) version for Mozilla and Opera using span tags.
    */
  function(node, te) {
      var pos, skip, spannode, middlebit, endbit, middleclone;
      skip = 0;
      if (node.nodeType == 3) {
		var tipo = (typeof te); 
		
		if(tipo == "string")
		{
			pos = node.data.toLowerCase().indexOf(te);
			if (pos >= 0) {
				spannode = document.createElement('span');
				spannode.className = 'highlight';
				middlebit = node.splitText(pos);
				endbit = middlebit.splitText(te.length);
				middleclone = middlebit.cloneNode(true);
				spannode.appendChild(middleclone);
				middlebit.parentNode.replaceChild(spannode, middlebit);
				skip = 1;
			}		
		}
		else
		{
			
			for(var j = 0; j < te.length; j++)
			{
				pos = node.data.toLowerCase().indexOf(te[j]);
				if (pos >= 0) {
					spannode = document.createElement('span');
					spannode.className = 'highlight';
					middlebit = node.splitText(pos);
					endbit = middlebit.splitText(te[j].length);
					middleclone = middlebit.cloneNode(true);
					spannode.appendChild(middleclone);
					middlebit.parentNode.replaceChild(spannode, middlebit);
					skip = 1;
				}
			}
		}
      }
      else if (node.nodeType == 1 && node.childNodes && !/(script|style)/i.test(node.tagName)) {
          for (var i = 0; i < node.childNodes.length; ++i) {
              i += $.highlight(node.childNodes[i], te);
          }
      }
      return skip;
  }

 ;
});

jQuery.fn.removeHighlight = function() {
 this.find("span.highlight").each(function() {
  with (this.parentNode) {
   replaceChild(this.firstChild, this);
   normalize();
  }
 });
 return this;
};