It feels like such a simple issue, but my function is incorrectly returning "1" instead of just an empty space "" in my textbox.
<td><input type="button" value="Space" name="Space" onClick='document.firstChild.search.value = document.firstChild.search.value.substring(0,document.firstChild.search.value.length*1) +1'/></td>
The reason for this behavior is the presence of the +1 at the end of your code:
<td><input type="button" value="Space" name="Space" onClick='document.firstChild.search.value = document.firstChild.search.value.substring(0,document.firstChild.search.value.length*1) +1'/></td>
(scroll to view it) ^^
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