/**
 * Search Engine Keyword Highlight (http://fucoder.com/code/se-hilite/)
 *
 * This module can be imported by any HTML page, and it would analyse the
 * referrer for search engine keywords, and then highlight those keywords on
 * the page, by wrapping them around <span class="hilite">...</span> tags.
 * Document can then define styles else where to provide visual feedbacks.
 *
 * Usage:
 *
 *   In HTML. Add the following line towards the end of the document.
 *
 *     <script type="text/javascript" src="se_hilite.js"></script>
 *
 *   In CSS, define the following style:
 *
 *     .hilite { background-color: #ff0; }
 *
 *   If Hilite.style_name_suffix is true, then define the follow styles:
 *
 *     .hilite1 { background-color: #ff0; }
 *     .hilite2 { background-color: #f0f; }
 *     .hilite3 { background-color: #0ff; }
 *     .hilite4 ...
 *
 * @author Scott Yang <http://scott.yang.id.au/>
 * @version 1.3
 */
Hilite={elementid:'content',exact:false,max_nodes:1000,onload:true,style_name:'hilite',style_name_suffix:true,debug_referrer:''};Hilite.search_engines=[['^http://(www)?\\.?google.*','q='],['^http://search\\.yahoo.*','p='],['^http://search\\.msn.*','q='],['^http://search\\.aol.*','userQuery='],['^http://(www\\.)?altavista.*','q='],['^http://(www\\.)?feedster.*','q='],['^http://search\\.lycos.*','query='],['^http://(www\\.)?alltheweb.*','q='],['^http://(www||uus)\\.ekspress.*','str='],['^http://(www||uus)\\.ekspress.*','sstring=']];Hilite.decodeReferrer=function(referrer){var query=null;var match=new RegExp('');for(var i=0;i<Hilite.search_engines.length;i++){match.compile(Hilite.search_engines[i][0],'i');if(referrer.match(match)){match.compile('^.*'+Hilite.search_engines[i][1]+'([^&]+)&?.*$');if(referrer.match(match)){query=referrer.replace(match,'$1');if(query){query=decodeURIComponent(query);query=query.replace(/\'|"/,'');query=query.split(/[\s,\+\.]+/);return query;}}}}return null;};Hilite.hiliteElement=function(elm,query){if(!query||elm.childNodes.length==0)return;var qre=new Array();for(var i=0;i<query.length;i++){query[i]=query[i].toLowerCase();if(Hilite.exact)qre.push('\\b'+query[i]+'\\b');else qre.push(query[i]);}qre=new RegExp(qre.join("|"),"i");var stylemapper={};for(var i=0;i<query.length;i++)stylemapper[query[i]]=Hilite.style_name+(i+1);var textproc=function(node){var match=qre.exec(node.data);if(match){var val=match[0];var k='';var node2=node.splitText(match.index);var node3=node2.splitText(val.length);var span=node.ownerDocument.createElement('SPAN');node.parentNode.replaceChild(span,node2);span.className=stylemapper[val.toLowerCase()];span.appendChild(node2);return span;}else{return node;}};Hilite.walkElements(elm.childNodes[0],1,textproc);};Hilite.hilite=function(){var q=Hilite.debug_referrer?Hilite.debug_referrer:document.referrer;var e=null;q=Hilite.decodeReferrer(q.replace(/\*/g,''));if(q&&((Hilite.elementid&&(e=document.getElementById(Hilite.elementid)))||(e=document.body))){Hilite.hiliteElement(e,q);}};Hilite.walkElements=function(node,depth,textproc){var skipre=/^(script|style|textarea)/i;var count=0;while(node&&depth>0){count++;if(count>=Hilite.max_nodes){var handler=function(){Hilite.walkElements(node,depth,textproc);};setTimeout(handler,50);return;}if(node.nodeType==1){if(!skipre.test(node.tagName)&&node.childNodes.length>0){node=node.childNodes[0];depth++;continue;}}else if(node.nodeType==3){node=textproc(node);}if(node.nextSibling){node=node.nextSibling;}else{while(depth>0){node=node.parentNode;depth--;try{if(node==null)node==null;if(node.nextSibling){node=node.nextSibling;break;}}catch(e){break;}}}}};if(Hilite.onload){if(window.attachEvent){window.attachEvent('onload',Hilite.hilite);}else if(window.addEventListener){window.addEventListener('load',Hilite.hilite,false);}else{var __onload=window.onload;window.onload=function(){Hilite.hilite();__onload();};}}