Javascript string formatting, short question
<p>How can I use javascript to add a number (any number between 0-100) followed by a underscore, before the variable value?</p>

<p>Example: </p>

<pre><code> 2000 becomes 12_2000   //a number of my choice is added followed by an underscore
 hello becomes 12_hello
</code></pre>

<p>The number (12 in this case) is a constant chosen by me!</p>

<p>Thanks</p>
