function log_out_comirm() {
	ht = parent.document.getElementsByTagName("body");
	ht[0].style.filter = "progid:DXImageTransform.Microsoft.BasicImage(grayscale=1)";
	if (confirm('确定要退出会员中心？')) {
		return true;
	}
	else	{
		ht[0].style.filter = "";
		return false;
	}
}

function log_out() {
	if( log_out_comirm())  parent.top.location.href='logout.asp';
}