function confirmSubmit()
{
	var agree=confirm("Are you sure you wish to continue?");
	if (agree) return true;
	else return false;
}

function toggle(obj) 
{
	var el = document.getElementById(obj);
	if (el) el.style.display = (el.style.display != 'none' ? 'none' : '' );
}

function hide(obj) 
{
	var el = document.getElementById(obj);
	el.style.display = 'none';
}

function unhide(obj) 
{
	var el = document.getElementById(obj);
	el.style.display = '';
}

function check_unhide(checkbox, obj) 
{
	var el = document.getElementById(obj);
	if (checkbox.checked) el.style.display = '';
	else el.style.display = 'none';
}