function show( el) {
  el.style.visibility = "visible";
  el.style.display = "block";
}

function hide( el ) {
  el.style.visibility = "hidden";
  el.style.display = "none";
}

function changeVersion() {
	var sb = document.getElementById(  'short_bio'  );
	var lb = document.getElementById( 'biography' );
	if( ( sb != null ) && ( lb != null ) ) {
		if( sb.style.display == 'none' ) {
                        show( sb );
                        hide( lb );                      
		} else {
                      show ( lb );
                      hide( sb );    
		}
	}
	return false;
}


function switch_install() {
         var els = document.getElementsByClassName( 'switch' );
	if( els ) {
 		 for( var i = 0; i < els.length; i++ ){
			els[i].onclick = function() { return changeVersion(); };
		}
	}
}