function visa_domare()
{
eval("divt2.style.visibility='hidden';");
 if(divt1.style.visibility == 'visible')
	{
	eval("divt1.style.visibility='hidden';");
	return false;
	}
	
if(divt1.style.visibility == 'hidden')	
    {
	eval("divt1.style.visibility='visible';");
	return false;
	}	
}
function visa_regler()
{
eval("divt1.style.visibility='hidden';");
 if(divt2.style.visibility == 'visible')
	{
	eval("divt2.style.visibility='hidden';");
	return false;
	}
	
if(divt2.style.visibility == 'hidden')	
    {
	eval("divt2.style.visibility='visible';");
	return false;
	}	
}
function gomma()
{
     eval("divt1.style.visibility='hidden';");
	eval("divt2.style.visibility='hidden';");
		
}