function showContent(showItem)
{var hideContent=showItem+"_a";document.getElementById(hideContent).className="hide";var showContent=showItem+"_b";document.getElementById(showContent).className="show";}
function hideContent(showItem)
{var hideContent=showItem+"_b";document.getElementById(hideContent).className="hide";var showContent=showItem+"_a";document.getElementById(showContent).className="show";}