Adding Focus To Form Elements

I need to have the cursor appear in the first input box on various pages. When I use the onLoad event in the body tag it works, but anywhere else it doesn't.

The problem is aside from my intro page, most of my other pages use a header and footer on the server side. The body tag is inside the header so I don't have access to it on the other pages. I tried adding a simple function at the bottom of the page, but it does not work.

<script>
function setFocus(){
frm.Name.focus();
}
setFocus();
</script>