function openwin1(){
w=window.open('./books/b_category.html','win','width=500,height=400,status=no,scrollbars=yes,directories=no,menubar=no,resizable=yes,toolbar=no');
}
function openwin2(){
w=window.open('./link/l_category.html','win','width=500,height=400,status=no,scrollbars=yes,directories=no,menubar=no,resizable=yes,toolbar=no');
}