function menu (i)
{

switch(i)
 {
  case 1:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
      window.document.m1.visibility="show";
      window.document.m2.visibility="hide";
      window.document.m3.visibility="hide"; 
      window.document.m4.visibility="hide"; 
	 return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[1].style.visibility='visible';
    layers[2].style.visibility='hidden';
    layers[3].style.visibility='hidden';
    layers[4].style.visibility='hidden';
	return;
   }
  case 2:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
     window.document.m1.visibility="hide";
     window.document.m2.visibility="show";
     window.document.m3.visibility="hide";
     window.document.m4.visibility="hide";
	 return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[1].style.visibility='hidden';
    layers[2].style.visibility='visible';
    layers[3].style.visibility='hidden';
    layers[4].style.visibility='hidden';
	return;
   }
  case 3:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
     window.document.m1.visibility="hide";
     window.document.m2.visibility="hide";
     window.document.m3.visibility="show";
     window.document.m4.visibility="hide";
	 return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[1].style.visibility='hidden';
    layers[2].style.visibility='hidden';
    layers[3].style.visibility='visible';
    layers[4].style.visibility='hidden';
	return;
   }
  case 4:
   {
    if ((navigator.appName=='Netscape') && (navigator.appVersion.charAt(0)<'5'))
     {
     window.document.m1.visibility="hide";
     window.document.m2.visibility="hide";
     window.document.m3.visibility="hide";
     window.document.m4.visibility="show";
	 return;
     }
    if (navigator.appVersion.charAt (0)<'5')
    {
    var layers=document.all.tags ("div");
    }
    else {
    var layers=document.getElementsByTagName("div");
    }
    layers[1].style.visibility='hidden';
    layers[2].style.visibility='hidden';
    layers[3].style.visibility='hidden';
    layers[4].style.visibility='visible';
	return;
   }
 }

}