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    <p>I found that in IE6 at least (I'm not sure about the more recent versions), the built-in Array type didn't have an indexOf method. If you're testing in IE, perhaps that's why you couldn't get started. I wrote this little addition to include in all my code:</p> <pre><code>if(!Array.prototype.indexOf){ Array.prototype.indexOf = function(obj){ for(var i=0; i&lt;this.length; i++){ if(this[i]===obj){ return i; } } return -1; }; } </code></pre> <p>I can't really take credit for this. It's probably a fairly generic piece of code I found in some tutorial or one of Doug Crockford's articles. I'm quite sure someone will come along with a better way of writing it.</p> <p>I find working in Firefox is a good place to start because you can install the Firebug console and get a better idea where things are going wrong. I admit that doesn't solve cross-browser problems, but at least it allows you to get a start on your project.</p> <p>This little piece of code will ensure you can use the indexOf method to find where a given value is in a one-dimensional array. With your 2-dimensional array, each element in the outer array is an array not a single value. I'm going to do a little test to see exactly how that works and get back to you, unless someone else comes in with a better answer. </p> <p>I hope this at least gets you started.</p> <p>UPDATE Assuming you have a browser that implements Array.indexOf, I've tried every which way to pass one of the array elements in your outer array. </p> <pre><code>alert(array.indexOf([3,56])) alert(array.indexOf("3,56")) </code></pre> <p>just return -1.</p> <p>Oddly,</p> <pre><code>alert(array.indexOf(array[1])) </code></pre> <p>correctly returns 1. But you need to know the index of the inner array to get the index! I can't see a way of passing an array to the indexOf method.</p>
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    1. POUsing indexOf method to find value in a 2D array
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    1. COI was going to mention this. I've been in positions in the past where I've been tearing my hair out over this. +1
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