function wopen(){
    var win_height;
    var win_width;
    var win_top = (screen.height - 768) / 2;
    var win_left = (screen.width - 1024) / 2;
    if( screen.height > 768 ){
        win_height = 768;
    } else {
        win_height = screen.height;
    }
    if( screen.width > 1024 ){
        win_width = 1024;
    } else {
        win_width = screen.width;
    }
    win_detail = 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width='+win_width+',height='+win_height+',top='+win_top+',left='+win_left;
    window.open("/member/login.asp","_blank", win_detail)
}