/* Esta es una modificación del script obtenido de: 	*/
/* http://www.kryogenix.org/code/browser/searchhi/ 	*/
/*							*/
/* google.dirson.com - 28/ene/2004			*/

function highlightWord(node,word)
{	
	// Iterate into this nodes childNodes
	if (node.hasChildNodes) 
	{
		var hi_cn;
		for (hi_cn=0;hi_cn<node.childNodes.length;hi_cn++) 
		{
			highlightWord(node.childNodes[hi_cn],word);
		}//for
	}//node.hasChildNodes
	
	// And do this node itself
	if (node.nodeType == 3) 
	{ // text node
		tempNodeVal = node.nodeValue.toLowerCase();
		tempWordVal = word.toLowerCase();
		if (tempNodeVal.indexOf(tempWordVal) != -1) 
		{
			pn = node.parentNode;
			if (pn.className != "palabra_buscada") 
			{
				// word has not already been highlighted!
				nv = node.nodeValue;
				ni = tempNodeVal.indexOf(tempWordVal);
				// Create a load of replacement nodes
				before = document.createTextNode(nv.substr(0,ni));
				docWordVal = nv.substr(ni,word.length);
				after = document.createTextNode(nv.substr(ni+word.length));
				hiwordtext = document.createTextNode(docWordVal);
				hiword = document.createElement("span");
				hiword.className = "palabra_buscada";
				hiword.appendChild(hiwordtext);
				pn.insertBefore(before,node);
				pn.insertBefore(hiword,node);
				pn.insertBefore(after,node);
				pn.removeChild(node);
			}//if pn.className
		}//if tempNodeVal
	}//node.nodeType
}//highlightWord

function googleSearchHighlight() 
{
	if (!document.createElement) return;
	ref = document.referrer;
	if (ref.indexOf('?') == -1) return;
	qs = ref.substr(ref.indexOf('?')+1);
	qsa = qs.split('&');
	for (i=0;i<qsa.length;i++) 
	{
		qsip = qsa[i].split('=');
	        if (qsip.length == 1) continue;
        	if (qsip[0] == 'q' || qsip[0] == 'p') 
        	{ // q=Google, p=Yahoo,búsquedas internas
			words = unescape(qsip[1].replace(/\+/g,' ')).split(/\s+/);
	                for (w=0;w<words.length;w++) 
	                {
				highlightWord(document.getElementsByTagName("body")[0],words[w]);				
                	}//for w
	        }//if qsip
	}//for i
}//googleSearchHighlight

window.onload = googleSearchHighlight;