function mainnavswitch(subnav)
{
	var submenus = new Array('regio','zoeken','over');
	for(i=0;i<submenus.length;i++)
	{
		if(submenus[i] != subnav)
		{
			document.getElementById('subnav-'+submenus[i]).style.display = 'none';
			document.getElementById('subnav-'+submenus[i]).style.visibility = 'hidden';
			document.getElementById('switch-'+submenus[i]).style.backgroundColor = 'transparent';
		}
	}
	if(document.getElementById('subnav-'+subnav).style.display != 'block')
	{
		document.getElementById('subnav-'+subnav).style.display = 'block';
		document.getElementById('subnav-'+subnav).style.visibility = 'visible';
		document.getElementById('switch-'+subnav).style.backgroundColor = '#EDF392';
	}
	else
	{
		document.getElementById('subnav-'+subnav).style.display = 'none';
		document.getElementById('subnav-'+subnav).style.visibility = 'hidden';
		document.getElementById('switch-'+subnav).style.backgroundColor = 'transparent';
	}
}

function checkbox_disable(obj)
{
	setvar = obj.checked;
	startobj = obj.parentNode.parentNode;
	numinputs = startobj.getElementsByTagName('input');
	numselects = startobj.getElementsByTagName('select');

	for(i=0;i<numinputs.length;i++)
	{
		numinputs[i].disabled = setvar;
	}
	for(i=0;i<numselects.length;i++)
	{
		numselects[i].disabled = setvar;
	}
	obj.disabled = false;
}