Reload images captcha javascript

<form method="POST">
<input type="hidden" name="PHPSESSID" value="0b21dde61d891cd" />
<img id="siimage" src="securimage_show.php?sid=2ef186788e"  

alt="CAPTCHA Image" width="126" height="36" /><br />
<input type="text" name="code" /><br />
<a href="#" onclick="document.getElementById('siimage').src =  

'securimage_show.php?' + Math.random(); return false">

 Reload Image</a>
<input type="submit" value="Submit Form" />
</form>

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