// 検索文字列
s = "<div class=\"headline\">\n"
  + "  <img src=\"/image/asukaze.png\" width=\"88\" height=\"31\"\n"
  + "       alt=\"[あすかぜ・ねっと]\" title=\"あすかぜ・ねっと\"\n"
  + "       class=\"headline\" />\n"
  + "</div>\n";

// 置換文字列
r = "あすかぜ・ねっと\n";

for(y=1; y<=Bottom; y++){
  for(x=1; x<=Right; x++){
    [x,y] = replace([x,y], s, r);
  }
}