Pastable version of Simple Form Validation

<pre class='prettyprint' language='javascript'>function getElementsByClass(searchClass, node, tag)
{
	var classElements = new Array();
	if ( node == null ) node = document;
	if ( tag == null ) tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp(&quot;(^|\\s)&quot;+searchClass+&quot;(\\s|$)&quot;);
	for (i = 0, j = 0; i &lt; elsLen; i++)
	{
		if ( pattern.test(els[i].className) )
		{
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

&lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot; xml:lang=&quot;en&quot; lang=&quot;en&quot;&gt;
&lt;head&gt;
	&lt;meta http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset=utf-8&quot;/&gt;
	&lt;title&gt;Sample Form&lt;/title&gt;
&lt;/head&gt;

&lt;body&gt;
	&lt;form method=&quot;post&quot; id=&quot;formID&quot; action=&quot;#&quot;&gt;
		&lt;fieldset&gt;
			&lt;legend&gt;Sample Form&lt;/legend&gt;
			&lt;label for=&quot;Username&quot; class=&quot;required&quot;&gt;Username:&lt;/label&gt;
			&lt;input type=&quot;text&quot; id=&quot;Username&quot; name=&quot;Username&quot; /&gt;

&lt;label for=&quot;Comments&quot;&gt;Comments&lt;/label&gt;
			&lt;textarea name=&quot;Comments&quot; id=&quot;Comments&quot; rows=&quot;10&quot; cols=&quot;40&quot;&gt;&lt;/textarea&gt;

&lt;input type=&quot;button&quot; value=&quot;Submit&quot; onclick=&quot;javascript:check(this);&quot; /&gt;
			&lt;input type=&quot;reset&quot; value=&quot;Reset&quot; /&gt;
		&lt;/fieldset&gt;
	&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;</pre>
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Pastable version of Simple Form Validation