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    copied!<p>What you are trying to do is javascript and you cannot do it like that.</p> <p>When you get <code>&lt;span id="UP"&gt;0.00&lt;/span&gt;</code> you can also add that hidden element with that value, add <code>ID</code> to hidden elements` and modify your javascript function to add values to those hidden elements</p> <pre><code>&lt;script type="text/javascript"&gt; function showUP(str) { if (str==""){ document.getElementById("UP").innerHTML=""; return; } if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else { // code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function(){ if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200){ document.getElementById("UP").innerHTML=xmlhttp.responseText; document.getElementById("UnitPrice").value=xmlhttp.responseText; } } xmlhttp.open("GET","getunitprice.php?q="+str,true); xmlhttp.send(); } function multiply(Quantity) { var totalPrice = parseFloat(document.getElementById("UP").innerHTML)*Quantity; document.getElementById("TP").innerHTML = totalPrice; document.getElementById("TotalPrice").value = totalPrice; } &lt;/script&gt; &lt;p&gt;&lt;/p&gt;&lt;div&gt;&lt;b&gt;UnitPrice: &lt;span id="UP"&gt;0.00&lt;/span&gt; &lt;/b&gt;&lt;input type="hidden" name="UnitPrice" id="UnitPrice" value=""/&gt;&lt;/div&gt;&lt;p&gt; &lt;p&gt;&lt;/p&gt;&lt;div&gt;&lt;b&gt;TotalPrice: &lt;span id="TP"&gt;0.00&lt;/span&gt; &lt;/b&gt;&lt;input type="hidden" name="TotalPrice" id="TotalPrice" value=""/&gt;&lt;/div&gt;&lt;p&gt; </code></pre>
 

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