function toggleDiv(div_name) 
{
	var instrEl = document.getElementById(div_name);
	if( instrEl == null ) {
		return false;
	}

	if( instrEl.style.display == 'none' ) {
		instrEl.style.display = "block";
	}
	else {
		instrEl.style.display = "none";
	}

	return true;
}

function goBack() {
	history.go(-1);
}

function goToURL(strurl) {
	window.location.href = strurl;
}