function toggle() {

	var pattern1e = /\/eng\//;
	var pattern1f = /\/fra\//;
	var here = location.href;

	if (pattern1e.test(here)) {

		here=here.replace(pattern1e, "/fra/")

		} else {

		if (pattern1f.test(here)) {
			here=here.replace(pattern1f, "/eng/");
			}

		}

	location.href = here;
	}