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    <p>There are quite a few things wrong with your markup and javascript. You have unclosed paragraph tags, you set the scope of currency to be global but then define a local variable with the same name when you want to set it (which is why currency is never being set globally), you're using an if/else statement where a switch/case is more appropriate... there's probably a lot more, and the more you learn the more you'll discover. Having said all that, because it bothered me, here's a modified version of your code which seems to do what you were after :</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;Rounded Commodity Pricing&lt;/title&gt; &lt;script type="text/javascript"&gt; var currency; function setCurrency(val) { currency = val; } function finddivid(marketprice, tradevalue) { var KWDex = 0.281955 var GBPex = 0.625907 var USDex = 1 var CADex = 0.998727 var EURex = 0.784594 var currencyMarketprice; switch (currency) { case "KWD": currencyMarketprice = Math.ceil(marketprice * KWDex); break; case "GBP": currencyMarketprice = Math.ceil(marketprice * GBPex); break; case "USD": currencyMarketprice = Math.ceil(marketprice * USDex); break; case "CAD": currencyMarketprice = Math.ceil(marketprice * CADex); break; case "EUR": currencyMarketprice = Math.ceil(marketprice * EURex); break; } if (tradevalue % currencyMarketprice == 0) return ("tonnage = " + tradevalue / currencyMarketprice + " mt, and price = " + currencyMarketprice + " " + currency + " per mt"); else { for (var counter = currencyMarketprice + 1; counter &lt; (currencyMarketprice * 2); counter++) { if (tradevalue % counter == 0) return ("tonnage = " + tradevalue / counter + " mt, and price = " + counter + " " + currency + " per mt"); } } } function calculate() { var mktprc = document.getElementById('mktprc'); var trdval = document.getElementById('trdval'); document.getElementById('showMeArea').value = finddivid(mktprc.value, trdval.value); } &lt;/script&gt; &lt;/head&gt; &lt;p&gt; Select currency: &lt;input type="button" value="KWD" onclick="setCurrency('KWD')"&gt; &lt;input type="button" value="USD" onclick="setCurrency('USD')"&gt; &lt;input type="button" value="GBP" onclick="setCurrency('GBP')"&gt; &lt;input type="button" value="EUR" onclick="setCurrency('EUR')"&gt; &lt;input type="button" value="CAD" onclick="setCurrency('CAD')"&gt; &lt;/p&gt; &lt;p&gt;Enter today's price of commodity in USD: &lt;input id="mktprc" input type="number"&gt;&lt;p&gt; &lt;p&gt;Enter value of trade: &lt;input id="trdval" input type="number"&gt;&lt;/p&gt; &lt;p&gt;&lt;input type="button" value="Calculate" OnClick="calculate();"&gt;&lt;/p&gt; &lt;p&gt; &lt;input id="showMeArea" readonly="true" size="100"&gt; &lt;/p&gt; &lt;/html&gt; </code></pre>
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    1. POHow do I call a function that enters text into a read-only text-box by clicking an HTML button?
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    1. COWow - thank you so much! Really impressed. This is exactly why I'm getting more and more interested in writing code. Things like switch/case I haven't seen yet in my very limited reading so wouldn't have known to use it! This is amazingly helpful. Thanks again.
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