if (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) >= 4) 
	{ IE4 = true; }
   else { IE4 = false; }    

if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 4) 
	{ NS4 = true; }
   else { NS4 = false; }

function MostraEsconde() {
	if (Cris.className == 'vis') {Cris.className='inv'}
	  else { if (Cris.className == 'inv') Cris.className='vis' }
}