function showSelector(seltop,selbot) {
	document.getElementById(seltop).style.visibility='visible';
	document.getElementById(selbot).style.visibility='visible';
}

function hideSelector(seltop,selbot) {
	document.getElementById(seltop).style.visibility='hidden';
	document.getElementById(selbot).style.visibility='hidden';
}

function showHideSection(secId)  {
	if (document.getElementById(secId).style.display == 'none') {
		document.getElementById(secId).style.display = 'block' ;
	}
	else {
		document.getElementById(secId).style.display = 'none' ;
	}
}