function showContent(id,id2){
 document.getElementById(id).style.visibility = 'visible';
 document.getElementById(id).style.display = 'block';
 document.getElementById(id2).style.visibility = 'hidden';
 document.getElementById(id2).style.display = 'none';}

function hideContent(id,id2){
 document.getElementById(id).style.visibility = 'hidden';
 document.getElementById(id).style.display = 'none';
 document.getElementById(id2).style.visibility = 'visible';
 document.getElementById(id2).style.display = 'block';
}