how to set a variable inside a page that uses a macro?

So I decided doing this in my macro with regards to injecting javascript
from a page that uses the macro master.ftl:

<#macro master  javascript="" >

 <#nested>

<script>
$(javascript}
</script>

</#macro>

Now my page looks like:

<#import "/layout/master.ftl" as p>
<@p.master>


</@p.master>

Now how can I create a javascript varialbe to pass to the master from
within this page?  Say I have this:

<#import "/layout/master.ftl" as p>
<@p.master>

function sayHello() {
  alert("hello world " + "${user.name}");
};


</@p.master>

How can I create a javascript variable and assign it to the javascript
function I created?

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