User input text box

I'm having a bit of trouble of getting the JavaScript code right. I need some help on what goes where and how it's supposed to look.

This is what I have so far in my script.

<script>
  var i = "1";
   var listItem = "";
  function processInput() {
 if (i <= 5) //Comparison operator//
      document.getElementById("listItem").innerHTML = (i <= 5);
  </script>

Here is my question:

Create a function called processInput(). Within the function create an if statement that runs if the value of i is less than or equal to 5. The if statement should perform the following actions:

• Set the value of the listItem variable to the string "item" concatenated with the value of i.
• Set the content of the element with an id equal to listItem to the value of the element with the id or toolbox.
• Set the value of the element with the id of toolbox to an empty string.

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I'm not sure if I'm setting this up right. I have tried w3Schools and the information on their site seemed to be unhelpful/unclear.