function returnTrue(){
	return true;
}

function periodMenu(item,M_bg,M_sel_bg){
	pastItem = document.getElementById('past');
	futureItem = document.getElementById('future');

	pastMenu = document.getElementById('pmenu');
	futureMenu = document.getElementById('fmenu');

	pastLink = document.getElementById('psl');
	futureLink = document.getElementById('fsl');

	if(item == 'past'){
		pastMenu.style.backgroundColor = M_sel_bg;
		futureMenu.style.backgroundColor = M_bg;

		pastLink.style.fontWeight = 'bold';
		pastLink.style.textDecoration = 'none';
		futureLink.style.fontWeight = 'normal';
		futureLink.style.textDecoration = 'underline';

		toggleItemById1('future','off');
		toggleItemById1('past','on');
	}else{
		pastMenu.style.backgroundColor = M_bg;
		futureMenu.style.backgroundColor = M_sel_bg;

		futureLink.style.fontWeight = 'bold';
		futureLink.style.textDecoration = 'none';
		pastLink.style.fontWeight = 'normal';
		pastLink.style.textDecoration = 'underline';

		toggleItemById1('past','off');
		toggleItemById1('future','on');
	}
	return false;
}
function EPperiodMenu(item,M_bg,M_sel_bg,ep){
	pastItem = document.getElementById(ep+'past');
	futureItem = document.getElementById(ep+'future');

	pastMenu = document.getElementById(ep+'pmenu');
	futureMenu = document.getElementById(ep+'fmenu');

	pastLink = document.getElementById(ep+'psl');
	futureLink = document.getElementById(ep+'fsl');

	if(item == 'past'){
		pastMenu.style.backgroundColor = M_sel_bg;
		futureMenu.style.backgroundColor = M_bg;

		pastLink.style.fontWeight = 'bold';
		pastLink.style.textDecoration = 'none';
		futureLink.style.fontWeight = 'normal';
		futureLink.style.textDecoration = 'underline';

		toggleItemById1(ep+'future','off');
		toggleItemById1(ep+'past','on');
	}else{
		pastMenu.style.backgroundColor = M_bg;
		futureMenu.style.backgroundColor = M_sel_bg;

		futureLink.style.fontWeight = 'bold';
		futureLink.style.textDecoration = 'none';
		pastLink.style.fontWeight = 'normal';
		pastLink.style.textDecoration = 'underline';

		toggleItemById1(ep+'past','off');
		toggleItemById1(ep+'future','on');
	}
	return false;
}
function toggleItemById1(item,type) {
  dataItem = document.getElementById(item);
  if (type == 'off') {
    dataItem.style.display = 'none';
  } else {
    dataItem.style.display = '';
  }
}
function toggleItemById(item) {
  dataItem = document.getElementById(item);
  if (dataItem.style.display == '') {
    dataItem.style.display = 'none';
  } else {
    dataItem.style.display = '';
  }
}

function toggleVWmenu(ID){
	for(i=0; i<7; i++){
		menuID = 'VWday' + i;
		cellID = 'VWslink' + i;
		toggleItemById1(menuID,'off')
		document.getElementById(cellID).className='VWtab';
	}
	menuID = 'VWday' + ID;
	cellID = 'VWslink' + ID;
	toggleItemById1(menuID,'on');
	document.getElementById(cellID).className='VWtab_sel';
}