function set_offset_menu() {
subm_length = $$('.submenu li').length;
switch(subm_length) {
	case 1: $$('#menu ul')[0].style.left = '303px'; break;
	case 2:
	case 3: $$('#menu ul')[0].style.left = '202px'; break;
	case 4:
	case 5: $$('#menu ul')[0].style.left = '101px'; break;
	case 6:
	case 7: $$('#menu ul')[0].style.left = '0'; break;
}
}

Event.observe(window, 'load', cerca_rollover);
Event.observe(window, 'load', set_offset_menu);