1function ToggleVis(number) { 2 // toggle visibility of a single chapter 3 id = "p" + number; 4 c = document.getElementById(id).className; 5 c = (c == "" ? "hiddenparagraph" : ""); 6 document.getElementById(id).className = c; 7} 8 9function SetEveryVis(status) { 10 // set visibility of every chapter 11 c = (status == 0 ? "hiddenparagraph" : ""); 12 for(i = 0; i <= 35; i++) { 13 document.getElementById("p" + i).className = c; 14 } 15} 16