The ancient Jewish custom of leasing leavened grain products to non-Jews during Passover has taken on a modern twist. Jews worldwide now use the Internet to find willing buyers for the pasta, cookies and crackers they must part with before the start of the eight-day holiday, which begins at sundown Wednesday. Old Bridge Rabbi Yossi Kanelsky unveiled his web site this year. “We want to include as many people as possible in the tradition,” said Rabbi Kanelsky, a spiritual leader with the Old Bridge chapter of Bris Avrohom, an international organization that serves Soviet Jewish emigrants. “That’s why we’ve offered it online..religious leaders like Rabbi Kanelsky have taken the sale of chametz to the Internet. Synagogues and Jewish organizations now provide Web forms for Jews who may have trouble getting to synagogue and for those who live in parts of the world with small or nonexistent Jewish communities. Jews who access Web sites such as www.torah.org and www.chabad.org fill out the sale form online, initial it electronically, and the rabbi takes it from there. On Bris Avrohom’s Web site, visitors click a “Sell Your Chometz” link, fill in their contact information and accept the terms of sale, which also extends to chametz inside pans and pots, on cooking utensils and to “all kinds of live animals and pets that have been eating chametz and mixtures thereof…