Edit "Available online" checkbox

Can someone tell me what I would need to change the code to in order to make the "available online" checkbox 'On' by default when someone adds a product through the admin?

The code is here in the Products_Insert.php file:

<p>
<label for="ProductLive" class="readonly-checkbox">Available Online:</label>
<input <?php if (!(strcmp((ValidatedField("ProductsInsert","ProductLive")),1))) {echo "checked=\"checked\"";} ?> name="ProductLive" type="checkbox" id="ProductLive" value="1" />
(check to make this item available for sale) </p>
<p>

To default a checkbox to it's checked state you only need to add in the checked="checked" attribute to the form element like this:

<input type="checkbox" checked="checked"

Be careful to only do this on the product insert page or you can automatically update your products to be online if you do this on the update page.