function changetext(){
	var wid = $(window).width();
	if(wid<=970){
		$('#xwzx').css({"backgroundPosition":"-400px"});
	}else{
		var s = (wid-970)/2;
		$('#xwzx').css({"backgroundPosition":(s-475)+"px"});
	}
}

function addFavorite(url, title) {
	try {
		window.external.addFavorite(url, title);
	} catch (e){
		try {
			window.sidebar.addPanel(title, url, '');
		} catch (e) {
			alert("请按 Ctrl+D 键添加到收藏夹");
			}
		}
}