function show(id)
{

  for(var i=1; i<10; i++)
  {
    var z = String(i);
    if(document.getElementById('c'+z))
    {
      document.getElementById('c'+z).style.display = "none";
    }
  }
  document.getElementById(id).style.display = "block";
}

var x = 0;
function hide_menu()
{
  if(x == 0)
  {
    document.getElementById('col1').style.display = "none";
    document.getElementById('col3').style.marginLeft = "15px";
    document.getElementById('show_hide').style.backgroundImage = "url(./images/menu_on.gif)";
    x = 1;
  }
  else
  {
    document.getElementById('col1').style.display = "block";
    document.getElementById('col3').style.marginLeft = "22.5%";
    document.getElementById('show_hide').style.backgroundImage = "url(./images/menu_off.gif)";
    x = 0;
  }
}