images within child theme on localhost not showing

Hi. New to WP. Have a quick question. Creating a childtheme from twenty twelve theme and want to have a link from the logo. Performing all work on localhost.

I have created a folder under the child theme with the name “images”. The image within is named “s2gglobe.png”.

In the header.php file in the child theme I have adjusted the header to try and include the logo in the header file:

<div class="childheader">
		<div class="childlogo">
			<a href="/"><img src="images/s2gglobe.png"></a>
		</div>
		<nav id="site-navigation" class="main-navigation" role="navigation">.......

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Don’t think the css should affect it but I am floating it – including the child css here also:

.childlogo {
float: left;
padding: 10px;
}

I am guessing that I am making a pretty easy error but I can’t seem to find out why the logo won’t appear – get a little box that I am expecting shows up when it can’t find your image. Anyone have any ideas?

Thansk.