rendered paste body# inside rhtml file
<% content_for :head do %>
<script type="text/javascript">
alert("google");
</script>
<% end %>
# inside layout file
<%= yield :head %>
# results in the following being rendered
<script type="text/javascript">
<div class="sourceRow"><a class="sourceLine">1</a><span class="sourceRowText"></span></div><div class="sourceRow"><a class="sourceLine">2</a><span class="sourceRowText"> alert("google");</span></div><div class="sourceRow"><a class="sourceLine">3</a><span class="sourceRowText"> </span></div>
</script>