Fixed Image float

Have added a 468×60 banner to the header section of my theme. The issue is that when I change the size of the window, the banner does not change with it, obviously making the blog look untidy.

The following is the code.

<?php wp_head(); ?>
<!-- start StanJames logo --><div style="float: right; position: relative; left: -214px; top: 65px;">
		<iframe src="http://rcm-uk.amazon.co.uk/e/cm?t=benidormia-21&o=2&p=26&l=ur1&category=sports_and_leisure&banner=0J3JB6BWSMCQZTCD6VG2&f=ifr" width="468" height="60" scrolling="no" border="0" marginwidth="0" style="border:none;" frameborder="0"></iframe></div>

	</head>

What is strange is that the same code is used on my other sites and they adjust according to screen width/height etc…bit miffed to be honest.

Any ideas would be much appreciated. Thanks – The Theme I am using is Technical Speech and the site is here.