Why doesn't javascript remove comma?

On this page http://www.bitesizebschool.com/copywriting/, I have the following javascript just below the body tag:

<script>
var cite = document.querySelector("#le_body_row_4_col_1_el_2 cite");
cite.innerHTML = cite.innerHTML.replace(/Source:,/,"Source:");
</script>

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I want to remove the comma in the first quote below the "start here" button: "Source:,". However, nothing is happening. Does anyone see what I'm doing wrong?
brettrAsked:
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Julian HansenConnect With a Mentor Commented:
To confirm F12 to view the console  you should see an undefined error
TypeError: cite is null
   cite.innerHTML = cite.innerHTML.replace(/Source:,/,"Source:");
/copywriting/ (line 134, col 1)

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In case $ is not defined
jQuery(function() {
  var cite = document.querySelector("#le_body_row_4_col_1_el_2 cite");
  cite.innerHTML = cite.innerHTML.replace(/Source:,/,"Source:");
});

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0
 
Julian HansenCommented:
The problem is because the script is running before the HTML has been rendered. Place the script in a document ready block
JQuery
$(function() {
  var cite = document.querySelector("#le_body_row_4_col_1_el_2 cite");
  cite.innerHTML = cite.innerHTML.replace(/Source:,/,"Source:");
});

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