var id = "pic" ;
var j ;

function Show( n )
  {
  for( j=1; j<=5; j++ )
    {
    if( j == n )
      {
      document.getElementById( id + j ).style.display = "block" ;
      }
    else
      {
      document.getElementById( id + j ).style.display = "none" ;
      }
    }

  return false;
  }