HTML dropdown menu not working in page

Hi,

The following code does not work on our WordPress site, but does work in other environments. After clicking the “Unlock it Now”, a checkout page should pop-up, but unfortunately, nothing happens.

Is anyone able to check on this issue, and let me know where the problem lies/how to fix? I’m not ready to upgrade to WP 3.3 as of yet, as not all plugins have been updated, and I don’t feel the need. If 3.3 solves the problem, I will update.

Thanks,
Adam

Code is here:
————–

<form>
<select name="menu" style="font-family:'Arial';color:#000000;background-color:#FFFFFF;font-weight:bold;font-size:16pt;">
<option value="http://www.freeunlocks.com/chooseyourphone/freesamsungunlocking/">Start Here - Choose One</option>
<option value="http://www.trialpay.com/productpage/?c=aaa57e5&tid=A7D7WAl">AT&T USA - Get it Free</option>
<option value="https://www.trialpay.com/cart/getwholesaleproducts/?c=aaa57e5&tid=6rGCkr1">AT&T USA  - Buy Now $11.99</option>
<option value="http://www.trialpay.com/stores/getwholesaleproducts/samsungunlockcode1?tid=RHysuuT">Samsung USA networks - Get it Free</option>
<option value="https://www.trialpay.com/cart/getwholesaleproducts/?c=43e1920&tid=RHyusu3">Samsung USA networks - Buy Now $36.99</option>
<option value="http://www.trialpay.com/productpage/?c=28e3a5c&tid=A7De7tn">Samsung Europe (incl. UK networks) - Get it Free</option>
<option value="https://www.trialpay.com/cart/getwholesaleproducts/?c=28e3a5c&tid=A7DXcXW">Samsung Europe (incl. UK networks) - Buy Now $19.99</option>
<option value="http://www.freeunlocks.com/contactus/">Coming Soon - Samsung Australia (contact us)</option>
<option value="http://www.freeunlocks.com/contactus/">Other - Contact Us - 8-24 Hour response time</option>
</select>
<input type="button" onClick="PopUpName=window.open('','PopUpName');PopUpName.location=this.form.menu.options[this.form.menu.selectedIndex].value;" value="Unlock it Now" style="font-family:'Arial';color:#000000;background-color:#FFFFFF;font-weight:bold;font-size:16pt;">
</form>