function popupWindow(url,width,height,scroll) {
	var popUpWin = 0;
	
	if (scroll==null) scroll=false;
	
	if(popUpWin) {
		if(!popUpWin.closed) popUpWin.close();
	}

	var left = (screen.width/2) - width/2;
  	var top = (screen.height/2) - height/2;
  	var scrolling = (scroll)?'yes':'no';

	popUpWin = open(url, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars='+scrolling+',resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
	popUpWin.focus();
}

function shTip(tip) {
	var tt = document.getElementById(tip);
	if (tt.style.display == 'none') {		
		tt.style.display = 'block';
		return false;		
		}
	else {
		document.location = document.getElementById(tip+'-a').href;		
	}
}

function closeTip(tip) {
	var tt = document.getElementById(tip);
	if (tt.style.display == 'block') {		
		tt.style.display = 'none';
		return false;		
	}
}