jQuery Change Image src Attribute

The most simple solution is to change image by class or id, this works for first tag with that class:

Source code viewer
<script type="text/javascript">
	$('.class').attr('src','image/dir/image-name.png');
</script>
Programming Language: Javascript

This code replaces src attributes of all tags with the class name:

Source code viewer
<script type="text/javascript">
	$('.class').each(function(){
		$(this).attr('src','image/dir/image-name.png');
	});
</script>
Programming Language: Javascript

This example changes size of all images in a tag which class is declared:

Source code viewer
<script type="text/javascript">
	$('.class a').each(function(){
		$(this).attr('style','width:150px;'+$(this).attr('style'));
	});
</script>
Programming Language: Javascript