var VorH = "visible" ;
var objid=document.getElementById('BlinkArea');
setInterval ( 'blink()',650 ) ; // 0.7秒間隔で繰返し実行します

	function blink() {
		if ( VorH == "visible" ) {
			document.getElementById('BlinkArea').style.visibility='hidden';
			VorH = "hidden" ;
		} else {
			document.getElementById('BlinkArea').style.visibility='visible';
			VorH = "visible" ; }
		}
	
	var VorH = "visible" ;