function randomtopbanner(){
var no = 78;
var index = Math.floor(Math.random() * no) + 1;
document.write('<div class="img_margin"><img src="../banners/banner-' + index + '.jpg" alt="topbanner" /></div>');
}
function randomtopbanner_sub(){
var no = 78;
var index = Math.floor(Math.random() * no) + 1;
document.write('<div class="img_margin"><img src="../../banners/banner-' + index + '.jpg" alt="topbanner" /></div>');
}
function randomtopbanner_sub_sub(){
var no = 78;
var index = Math.floor(Math.random() * no) + 1;
document.write('<div class="img_margin"><img src="../../../banners/banner-' + index + '.jpg" alt="topbanner" /></div>');
}