function showMenu(whichOne){
	if (document.all) 
		eval(whichOne + ".style.visibility = 'visible'");
	else
		eval("document." + whichOne + ".visibility = 'visible'");
}

function hideMenu(whichOne){
	if (document.all) 
		eval(whichOne + ".style.visibility = 'hidden'");
	else
		eval("document." + whichOne + ".visibility = 'hidden'");
}