function visible(what)
{
	var IE = document.all?true:false;
	if(IE) block = 'block';
	else block='table-row';

	document.getElementById(what).style.display=block;
}

function invisible(what)
{
	var IE = document.all?true:false;
	if(IE) block = 'block';
	else block='table-row';

	document.getElementById(what).style.display='none';
}