/* http://www.kryogenix.org/code/browser/searchhi/ */
/* Modified 20021006 to fix query string parsing and add case insensitivity */
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);
		}
	}
	
	// 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 != "searchword") {
				// 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));
				//only highlight if starts with.
			    if(before.nodeValue=="" || before.nodeValue.charAt(before.nodeValue.length-1)==" " || 
			        before.nodeValue.charAt(before.nodeValue.length-1)=="-")
			    {
			        docWordVal = nv.substr(ni,word.length);
			        after = document.createTextNode(nv.substr(ni+word.length));
			        hiwordtext = document.createTextNode(docWordVal);
			        hiword = document.createElement("span");
			        hiword.className = "searchword";
			        hiword.appendChild(hiwordtext);
			        pn.insertBefore(before,node);
			        pn.insertBefore(hiword,node);
			        pn.insertBefore(after,node);
			        pn.removeChild(node);
			    }
			}
		}
	}
}

function googleSearchHighlight() {
	if (!document.createElement) return;
	ref = document.location.href;
	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] == 'arg') { // q= for Google, p= for Yahoo
			words = unescape(qsip[1].replace(/\+/g,' ')).split(/\s+/);
			var el = document.getElementById("content-body");
			if(el!=null)
			{
			    for (w=0;w<words.length;w++) {
		            highlightWord(el,words[w]);
        	    }
        	}
	    }
	}
}

window.onload = googleSearchHighlight;