Change div value based on textbox value using jQuery
<p>I created this fiddle that the div value changes based on your dropdown list selection. <a href="http://jsfiddle.net/qSkZW/20/" rel="nofollow">http://jsfiddle.net/qSkZW/20/</a></p>

<p>I want to take it one step further and this is to create a textbox field that if you add for example the number <code>2</code> it will change the div value to 240 (in real the 120 you find in the script it will be a php var). If it writes <code>3</code> then to 360.</p>

<p>Additionally there must be two limitations.</p>

<ol>
<li>Prevent them from using non-numeric characters.</li>
<li>The maximum number is pre-configured (from a php variable). Like if the max value is set to 10, if the user writes 30 it will return to 10.</li>
</ol>

<p>Thank you for your help.</p>
