/* http://www.kryogenix.org/code/browser/searchhi/ */
/* Modified 20021006 to fix query string parsing and add case insensitivity */
/* Modified 20070316 to stop highlighting inside nosearchhi nodes */
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 ;
			// check if we're inside a "nosearchhi" zone
			checkn = pn ;
			while( checkn.nodeType != 9 && checkn.nodeName.toLowerCase() != 'body')
			{// 9 = top of doc
				if( checkn.className.match(/\bnosearchhi\b/) ) { return ; }
				checkn = checkn.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 ) ) ;
				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 = '?' + window.location.search.substring( 1 ) ;
	if( ref.length < 2 || ref.indexOf('?') == -1 ) 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' || qsip[0] == 'chercher')
		{ // q= for Google, p= for Yahoo
			words = unescape(qsip[1].replace(/\+/g,' ')).split(/\s+/) ;
	                for( w = 0 ; w < words.length ; w ++)  highlightWord( document.getElementsByTagName("body")[ 0 ],words[ w ] )  ;
	        }
	}
}

window.onload = googleSearchHighlight ;