/* [注]　IE、Netscapeでは動作しますが、Firefoxでは動作しません */
	/* モニタの1/2サイズのウィンドウを画面中央に開く */
	var win;
	function winOpenScreenCenter(){
	  var ofst=2;
	  var abcd=740;
	  var efgh=593;
	  var width=screen.availWidth - 740;
	  var height=screen.availHeight - 593;
	  if(!win || win.closed()){
	    var win = window.open("vpp/vpp00.html","exp","width="+abcd+",height="+efgh+",scrollbars=yes");
	    win.focus();
	  }else{
	    win.focus();
	  }
	  win.moveTo(0,0)
	  win.moveTo(width/2, height/2);
	}