function addEngine(A){if(window.external&&("AddSearchProvider" in window.external)){window.external.AddSearchProvider(A);return false}else{alert(error_opensearch_unsupported);return true}}

function check_url(u){
	var reg = /^(http|ftp|https)+:\/\/.+\..+.*$/;
	if(!reg.test(u))
	{
	alert("网址无效,请重新输入");
	return false;
	}else{
		return true;
	}
}
function check_keyword(k){
	var reg = /^(http|ftp|https):\/\/.*$/;
	if(reg.test(k))
	{
	alert("关键字无效,请重新输入");
	return false;
	}else{
		return true;
	}
}