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    <p>Since JavaScript numbers can hold integers of over 50 bits, 3 numbers could keep track of 150 files. </p> <p>The following code provides functions for creating, manipulating and interrogating a data structure consisting of an array of 50 bit numbers:</p> <pre><code>function Set (len) { // Establish an array of sufficient 50 bit numbers to hold len bits this.bits = new Array (Math.floor ((len + 49) / 50)); this.len = len; // Clear all numbers for (var i = this.bits.length; i--;) this.bits[i] = 0; } Set.prototype.full = function () { // Check if all bits of the set at 1 // First check the relevant bits of the last word if (this.bits[this.bits.length - 1] === Math.pow (2, this.len + 1) - 1) // Then chec tat all remaining numbers are full for (var i = this.bits.length - 1; i--;) if (bits[i] !== Math.pow (2, 51) - 1) return false; return true; } Set.prototype.check = function (n) { // Return value (0 or 1) of bit n of the set var m = n % 50; return Math.floor (this.bits [(n - m) / 50] / Math.pow (2, m)) &amp; 1; } Set.prototype.add = function (n) { // Set bit n of the set to 1 (unless it is already 1) if (!this.check (n)) { var m = n % 50; this.bits [(n - m) / 50] += Math.pow (2, m); return true; } return false; } Set.prototype.remove = function (n) { // Set bit of the set to 0 (unless it is already 0) if (this.check (n)) { var m = n % 50; this.bits [(n - m) / 50] -= Math.pow (2, m); return true; } return false; } Set.prototype.clear = function () { // Clear all bitsof the set to 0 for (var i = this.bits.length; i--;) bits[i] = 0; } </code></pre>
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    1. POA script that loads an image at random from an array without repeating any until all have been viewed
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    1. COThanks. Does this work with my existing script or in place of it?
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    2. COMy code provides only the functions to manage a boolean set. You also need the code to use those functions and to save the set values in cookies. See here http://jsfiddle.net/bVHMJ/2/
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    3. COThe names in the file array seem to be incorrect : extra spaces. Did you check your JS console for error messages? Also remove the first script block, it is no longer necessary.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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