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    <p>Add <code>onclick="change()"</code> to the element. </p> <p>Edit:</p> <pre><code>function change(x) { if(x=="something"){ var target = document.getElementById("target"); if (y == "imgA") {target.className = "cast1";} else if (y == "imgB") {target.className = "cast2";} else if (y == "imgC") {target.className = "cast3";} else if (y == "imgD") {target.className = "cast4";} else {target.className = "chart";} } } </code></pre> <p>Alternately if you mean to only allow the function to execute when called by a particular element you can check the element. The <code>this</code> reference will refer to the element that owns the function.</p> <pre><code>function change(x) { if(this.id == "target") var target = document.getElementById("target"); if (y == "imgA") {target.className = "cast1";} else if (y == "imgB") {target.className = "cast2";} else if (y == "imgC") {target.className = "cast3";} else if (y == "imgD") {target.className = "cast4";} else {target.className = "chart";} } } </code></pre> <p>Edit2:</p> <p>Normally you would bind using <code>element.onclick</code> however when using the inline declaration the <code>this</code> reference refers to the window.</p> <p>Details here <a href="http://www.quirksmode.org/js/this.html" rel="nofollow">http://www.quirksmode.org/js/this.html</a></p> <p>Without changing your code too much you can change your function slightly as suggested below.</p> <pre><code>function change(element,x) { if(element.id=="target"){ var target = document.getElementById("target"); if (y == "imgA") {target.className = "cast1";} else if (y == "imgB") {target.className = "cast2";} else if (y == "imgC") {target.className = "cast3";} else if (y == "imgD") {target.className = "cast4";} else {target.className = "chart";} } } </code></pre> <p>Then change your inline onclick to pass a reference to the element. <code>onclick="change(this,'target')"</code></p> <p>Generally its considered bad practice to use inline onclick declarations. So consider doing your click binding in script.</p>
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    1. COcan I onclick=change('target') so if there is another function anywhere in the code, it will not trigger without a specific reference by id target?
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    2. COHow do you mean? If you mean can you check for a specific target you can do that in your function. If you mean another change function with different parameters, that is something you can't do in javascript. It's called function overloading and isn't supported.
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    3. CONot sure what you mean by 'check in your function'
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