Disply list post by first letter and on two columns

Hi,

I have code that search on a specific category posts that start with a specific letter (here : B letter) and disply it : http://wordpress.pastebin.com/HbpzA2CD

Now, i need to disply this list on two columns like this :

http://perishablepress.com/press/wp-content/images/2008/horiz-order/horizontal-order_php.gif

using this code :

http://wordpress.pastebin.com/adX0k058

To disply this result on two columns i do this code (but do not work) : http://wordpress.pastebin.com/EVqYmM33

Need help please.