Showing payment options directly on cart?

[Pejo]

Hi,

I have Joomla 2.5.17 and Virtuemart 2.0.26

Also, I have turned on "one page checkout". Only thing that is bothering me is when you need to choose payment option, that option opens in new page, you check your preferred option and than you are sent back to cart.

Is there some what to edit some .php file so when you enter your cart, that there is immediately payment options so you can choose on cart (not to be sent on new page), for example, like it is "terms and conditions" check box?

Thanks in advance.