// JavaScript Document
if (document.images) {
   img20 = new Image(); img20.src = "book/index/tab_over_img_01.jpg";
   img21 = new Image(); img21.src = "book/index/tab_over_img_02.jpg";
   img22 = new Image(); img22.src = "book/index/tab_over_img_03.jpg";
   img25 = new Image(); img25.src = "book/index/tab_over_img_04.jpg";
}
function setImage(img, image) {
   if (img) {
      img.src = image;
   }
}




function LinkSelect(form, sel)
{
adrs = sel.options[sel.selectedIndex].value;
if (adrs != "-" ) location.href = adrs;
}