changing product layout, need to display 4 column

[paha]

changing product layout, need to display 4 column in the category page of the product



so instead of showing only one product per row, show 4 products per row

So I need the products to be displayed as the y can in new products box of the main page, but in the category pages


first picture tipical display

second picture the way I need it to be displayed


thank you for your help :)

I need to display as in this shop

http://www.bigcheesebadges.com/i-lov...11626bd494ec16