Learning javascript, can't figure out hide and show elements -

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edit- see written in javascript, not jquery or framework please.

i know accomplished jquery, i'd learn javascript behind magic, , have been reading dom scripting jeremy keith.

i've gotten ways through book, doing examples copy code far different trying build yourself.

right i'm trying simple (for others): hide paragraph element when header2 element above clicked. here html:

<div id="contentarea">         <h2><a href="#">heading articles</a></h2>         <p>lorem ipsum dolor sit amet, consectetur adipiscing elit. integer nec odio. praesent libero. sed cursus ante dapibus diam. sed nisi. nulla quis sem @ nibh elementum imperdiet. duis sagittis ipsum. praesent mauris. fusce nec tellus sed augue semper porta. mauris massa. vestibulum lacinia arcu eget nulla. </p>         <h2><a href="">second heading articles</a></h2>         <p>lorem ipsum dolor sit amet, consectetur adipiscing elit. integer nec odio. praesent libero. sed cursus ante dapibus diam. sed nisi. nulla quis sem @ nibh elementum imperdiet. duis sagittis ipsum. praesent mauris. fusce nec tellus sed augue semper porta. mauris massa. vestibulum lacinia arcu eget nulla. </p>     </div><!-- end main content ---------------->

i'm trying figure out steps necessary accomplish it, , can't spell out myself in plain english, less javascript.

i'm trying create block of code "whenever h2 element within div id contentarea clicked, find next paragraph below , hide view."

// select h2 inside contentaread var elems = document.getelementbyid('contentarea').getelementsbytagname('h2'), i;  // each 1 for(i = 0; < elems.length; i++)    elems[i].onclick = function(){         var sibling = this;         // while there sibling         while(sibling = sibling.nextsibling){             // if sibling p tag             if(sibling.nodename == 'p'){                 // hide                 sibling.style.display = 'none';                 // exit loop                 break;             }         }     };

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