wrong value in cart total

hello people!
i will explain the problem as clear and short as i can.
1. i have multi currency switcher in my website.
2. i have ‘name your price’ plugin, that allow the visitors to enter the price they want to pay (for donation purpose).
3. the default currency is ILS. 1 USD = 3.2 ILS, 1 EUR = 3.64 ILS.

the problem is: when i’m enter value into ‘open price’ product, and it’s NOT ILS, the value in cart total divided to ILS. for example: i want to donate 100$, but in cart total it’s becoming only 31 USD (it’s taking 100 and DIVIDE it by 3.2, what don’t make any sence).
i want this value to reamin as i enter it. if i’m enter 100$ or 100 eur, just leave it 100 without changes.
i will be grateful for any help or advice. tnx

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