# 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(&quot;google&quot;);</span></div><div class="sourceRow"><a class="sourceLine">3</a><span class="sourceRowText"> </span></div>
</script>