if(0 < YAHOO.env.ua.ie && YAHOO.env.ua.ie < 9) {
	//for IE
	document.styleSheets[1].addRule("#list", "visibility: hidden;");
	document.styleSheets[1].addRule("#list ul.list li.sub", "display: none;");
} else if(document.styleSheets[0].insertRule) {
	//for Safari 2.x
	if(YAHOO.env.ua.webkit != 0 && YAHOO.env.ua.webkit < 522) {
		document.write('<style type="text/css">#list { visibility: hidden; }</style>');
		document.write('<style type="text/css">#list ul.list li.sub { display: none; }</style>');
	}
	//for Mozilla
	document.styleSheets[1].insertRule("#list { visibility: hidden; }", document.styleSheets[1].cssRules.length);
	document.styleSheets[1].insertRule("#list ul.list li.sub { display: none; }", document.styleSheets[1].cssRules.length);
}