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    copied!<p>To <em>hide</em> them, use the following approach (since IE bug prevents using CSS "display" property setting to "none" on an OPTION):</p> <p>-Store the original list of options in an array</p> <p>-Have a function to build the select #x from an array, slipping previously selected items</p> <p>-Assign an onchange handler for all selects which loops through all later selects and calls this function.</p> <pre><code>var option_value_order = {'volvo', 'saab', 'mercedes'}; var option_display_strings = new Array(); option_display_strings['volvo'] = 'Volvo'; //... // Assume each of the selects' ID value is "select_1", "select_2" instead of "1", "2" function redraw(selectNum) { var selectId = "select_" + selectNum; var s = document.getElementById(selectId); s.options.length = 0; // empty out var next = 0; for (var i = 0; i &lt; option_value_order.length; i++) { var skip = 0; for (var select_index = 0; select_index &lt; selectNum; select_index++) { if (document.getElementById("select_"+select_index).selected == i) skip = 1; if (skip == 0) { var o = option_value_order[i]; s.options[next] = o; // Don't recall how to set value different from option display, // using option_display_strings[o] next++; } } } } var total_selects = 2; function change_later_selects(s) { var select_num = find_number(s.id); "this returns number 2 for "select_2" - homework for (var i = select_num + 1; i &lt;= total_selects; i++) { redraw(i); } } </code></pre> <p>And then the HTML</p> <pre><code>&lt;select id="select_2" onchange="change_later_selects(this);"&gt; &lt;option value="volvo"&gt;Volvo&lt;/option&gt; &lt;option value="saab"&gt;Saab&lt;/option&gt; &lt;option value="mercedes"&gt;Mercedes&lt;/option&gt; &lt;/select&gt; </code></pre>
 

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