USing a Variable with == javascript:window.location.href

I first need to say my skills in this area are vary basic and I often have to code Javascript with the help of Google..

This block of code works --  An displays the proper URL vale.
<script language="JavaScript">  document.write(document.referrer); </script>

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This block of code where I hard code a URL also works as I need it to.
<INPUT TYPE="button" class="largeButton"  VALUE="Back" onclick="javascript:window.location.href=''; return false;" >

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But when I try and combine the two functions into one so that the code can be reused with out being updated each time, it breaks.   Everything to the right of  <script language="javascript">   appears as text on the page -- "document.................."
<INPUT TYPE="button" class="largeButton"  VALUE="Back" onclick="javascript:window.location.href=<script language="JavaScript"> document.write(document.referrer) </script> ; return false; " >

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So I must not be building the string incorrectly, but I am not sure what I am missing and while Google has found some examples, all are back a few years and so far nothing has helped..

TIA --
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PhonebuffAuthor Commented:
Never Mind Found the Answer --

<script language="JavaScript"> var $link; $link = document.referrer; </script> 
<INPUT TYPE="button" class="largeButton"  VALUE="Back" onclick="javascript:window.location.href=$link; return false;" >

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PhonebuffAuthor Commented:
Found my own answer --
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