var obj1="";
var obj2="";
var einsprung=false;
function showNav(what,what2)
{

if(obj1!="")
{
obj1.style.visibility='hidden';
}
obj1="";
if(document.getElementById(what))
{
obj1=document.getElementById(what);

obj1.style.visibility='visible';
}
else
{
if(einsprung!=false)
{
einsprung.style.visibility='visible';
if(obj1!="")
{
obj1.style.visibility='hidden';
}
obj1=einsprung;
}
}
}

function hideIt()
{
if(obj1!="" && obj1!=einsprung)
{
obj1.style.visibility='hidden';
obj1="";
if(einsprung!=false)
{
einsprung.style.visibility='visible';
if(obj1!="")
{
obj1.style.visibility='hidden';
}
obj1=einsprung;
}
}

}

function checkUnav(what,what2)
{
if(document.getElementById(what))
{
obj1=document.getElementById(what);
obj1.style.visibility='visible';
einsprung=obj1;
}
if(document.getElementById(what2))
{
obj1=document.getElementById(what2);
obj1.style.visibility='visible';
einsprung=obj1;
}
}