// Common interface functions // establish "urlStart", for referencing files (e.g. images) in JavaScript-generated HTML var urlStart = location.href.substr (0, location.href.indexOf("lbp5e/")) + "lbp5e/"; // Set the following variable to the frame to be drawn to var displayFrame; // Layer_Display: set the stylesheet "display" copy of layer l to d function Layer_Display (l, d) { displayFrame.document.getElementById(l).style.display = d; // works in both IE and NS6 } function Layer_Vis (l, v) { displayFrame.document.getElementById(l).style.visibility = v; } // -------------------------------------------------- // Store_Cookie: store the named value in a cookie. Adapted from code on p. 336 of Rhino book // -------------------------------------------------- function Store_Cookie (name, value) { var later = new Date(); later.setFullYear (later.getFullYear() + 10); document.cookie = name + "=" + escape(value) + "; path=/; expires=" + later.toGMTString(); } // -------------------------------------------------- // Get_Cookie: get the value of the named cookie. Adapted from code on p. 338 of Rhino book // -------------------------------------------------- function Get_Cookie (name) { var allcookies = document.cookie; var pos = allcookies.indexOf (name + "="); if (pos != -1) { var start = pos + name.length + 1; var end = allcookies.indexOf (";", start); if (end == -1) end = allcookies.length; return unescape (allcookies.substring (start, end)); } else return ""; } function Stored_Chapter () { var ch = Get_Cookie ("chapter"); if (ch == "") return -1 else return ch; } var editMode = (Get_Cookie("edit") == "true"); // search string when the page is loaded should start with "cc" // chapnum should be -1 for the chapter index or book home; otherwise a number to indicate the chapter we're working on var searchArr = location.search.substr(1).split("_"); // If we don't find a chapter number in the search string, look for it in a cookie // Stored_Chapter will return -1 if there's nothing there either. if (searchArr[0] == "") { chapnum = Stored_Chapter(); } else { chapnum = searchArr[0] * 1; } // load the .js file that defines the headings, questions, etc. for the specified chapter // (unless we're showing the chapter index, // or unless we're showing tutorials, in which case there is a "metafile" for the tutorials in all the chapters if (chapnum != -1 && location.href.indexOf("tutorials") == -1) { // In editMode, load the data dynamically // if (editMode) { // document.writeln('