[Kolyaj]

window.onload = function() {
    var els = document.getElementsByTagName('p');
    for (var i = 0; i < els.length; i++) {
        if (els[i].className == 'i-price') {
            els[i].innerHTML = els[i].innerHTML.replace(/([\d.]+) USD/, function(all, price) {
                return (parseFloat(price) * 35) + ' руб.';
            });
        }
    }
};