Proper way to have an anchor tag with onclick event

I came across one annoying error while coding in javascript for IE.

After debugging for several hours, commenting, uncommenting the parts of code I identified that accessing body element in the javascript before entire body element is formed, will throw the alert of 'Permission Denied' which is unrelated to what ever the actual problem is.

This happens only with IE.

So the solution for this IE only problem is add defer attribute to the
script tags manipulating body element.

Like

<script type="text/javascript" defer>
...access body element...
</script>