[jQuery] Can't use attr to set style of an element on IE6

[jQuery] Can't use attr to set style of an element on IE6

Hello,
I can't seem to use <span style="font-weight: bold;">attr </span>to set the style of an element on IE6. Is this an expected behaviour? Why?
<span style="font-family: courier new,monospace;"><html>
</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">    <head></span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">
        <script type="text/javascript" src="jquery.js"></script></span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">        <script type="text/javascript">
</span><br style="font-family: courier new,monospace;"><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">            $(document).ready(function(){</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">                $("#abc_xpto").attr("href", "<a href="http://www.xpto.com">http://www.xpto.com</a>");</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">                $("#abc_show").attr("style", "abc");</span><br style="font-family: courier new,monospace;"><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">            });</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">        </script>    </span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">    </head></span><br style="font-family: courier new,monospace;"><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">    <body>
</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">        <a id="abc_xpto" href="#">MI toca vai!</a></span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">        <div id="abc_show" style="display: block;"></span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">
            Cucu</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">        </div></span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">
    </body></span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"></html></span><br clear="all">
--
Os melhores cumprimentos
Rui Pedro Alves
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