How to format a URL string based on the <form>
===

My goal is to end up with something like this:

domain.com/?q=keyword&ftx=1,2,3,4

my &lt;form> has 10 checkboxes, like this below:

<pre>&lt;form method="get" id="searchform2" action="/"&gt;
	&lt;input type="text" class="field" name="q" id="s" placeholder="Search" /&gt;
	&lt;input type="submit" class="submit" name="submit" id="searchsubmit" value="Submit" /&gt;

	&lt;ul class="unstyled"&gt;&lt;li&gt;&lt;input type='checkbox' name='ftx[]' value='7'  /&gt;&nbsp;

		&lt;label class='checkbox' for='ftx[]'&gt;Test7&lt;/label&gt;&lt;/li&gt;
		&lt;li&gt;&lt;input type='checkbox' name='ftx[]' value='13'  /&gt;&nbsp;
		&lt;label class='checkbox' for='ftx[]'&gt;Test13&lt;/label&gt;&lt;/li&gt;
		&lt;li&gt;&lt;input type='checkbox' name='ftx[]' value='12'  /&gt;&nbsp;
		&lt;label class='checkbox' for='ftx[]'&gt;Test12&lt;/label&gt;&lt;/li&gt;
		&lt;li&gt;&lt;input type='checkbox' name='ftx[]' value='3'  /&gt;&nbsp;
		&lt;label class='checkbox' for='ftx[]'&gt;Test3&lt;/label&gt;&lt;/li&gt;
		&lt;li&gt;&lt;input type='checkbox' name='ftx[]' value='14'  /&gt;&nbsp;
		&lt;label class='checkbox' for='ftx[]'&gt;Test14&lt;/label&gt;&lt;/li&gt;
		&lt;li&gt;&lt;input type='checkbox' name='ftx[]' value='9'  /&gt;&nbsp;
		&lt;label class='checkbox' for='ftx[]'&gt;Test9&lt;/label&gt;&lt;/li&gt;
	&lt;/ul&gt;
&lt;/form&gt;</pre>

Would I need to use JavaScript to achieve the URL structure above?  Or what would be the best approach to accomplish this?

(I'm trying to avoid using a POST so that the URL is copy-able.