javascript - transforming jquery to java script -

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i have script made jquery using show / hide divs on page. need made purely in javascript , have no idea how this. me ??? think need converter or . . . 

$("#optiuni").children().click(function(){     $("#" + $(this).attr('name')).show().siblings().hide();     /*gives  link-activ class link clicked link-inactive others*/     $(this).attr('class','link-activ').siblings().attr('class','link-neactiv'); }); /*this makes shure first option list active  incarcarea paginii*/ $("#optiuni li.prima").children().click();

sample markup:

<div id="lista">   <ul id="optiuni">     <li id="titlu-lista-p"> <p class="listname-t">past events </p></li>      <li name="opt-1" class="prima"><a href="#"><p class="listdata">28.02.2011</p><p class="listname">tabu oscar party</p> </a></li>      <li name="opt-2" ><a href="#"><p class="listdata">24.03.2011</p><p class="listname">cheese & wine</p></a></li>     <li name="opt-8"><a href="#"><p class="listdata">08.04.2011</p><p class="listname">george baicea</p></a></li>   </ul> </div>  <div class="centru">   <div id="continut" >     <div id="opt-2" class="galerie" style="background-color: black;">       <iframe id="gal" src="cheese/index.html"></iframe>     </div>     <div id="opt-1" class="galerie" style="background-color: black;">       <iframe  src="tabu/index.html"></iframe>     </div>      <div id="opt-8" class="galerie" style="background-color: blue;">       <iframe   src="no-ev/index.html"></iframe>     </div>   </div> </div>

here's example of how based on markup linked to in comment, there assumptions make based on jquery version don't hold when see markup.

jsfiddle live example.

// ie sucks function addevent(el, name, handler) {   if (el.addeventlistener) {     el.addeventlistener(name, handler, false);   } else if (el.attachevent) {     // make sure "this" references element we're adding event handler     el.attachevent('on' + name, function() { handler.call(el, window.event); });   } }  function eachelementsibling(el, func) {   var childnodes = el.parentnode.childnodes;   (var = 0, sibling; sibling = childnodes[i]; i++) {     if (sibling.nodetype !== 1 || sibling === el) {       continue;     }     func(sibling);   } }  function activatelink() {   var eltoshow = document.getelementbyid(this.getattribute('name'));   eltoshow.style.display = '';   eachelementsibling(eltoshow, function(s) { s.style.display = 'none'; });   this.classname = 'link-active';   eachelementsibling(this, function(s) {     if (s.getattribute('name')) { s.classname = 'link-neactiv'; }   }); }  var items = document.getelementbyid('optiuni').getelementsbytagname('li'); var initialitem = null; (var = 0, item; item = items[i]; i++) {   // need filter, non-link items present in list   if (item.getattribute('name')) {     addevent(item, 'click', activatelink);     if (item.classname === 'prima') {       initialitem= item;     }   } } if (initialitem) {   activatelink.call(initialitem) }

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