Array Object - array_name[index_number]

Image Object - image_name.src = image_file.file_type

Cookie Object - document.cookie = cookie_name+"="+string_variable

Form Object - document.form_name.element_name
usually addressed by a property.
partial list of properties:
document.form_name.element_name.value
document.form_name.element_name.text
document.form_name.element_name.checked
document.form_name.element_name.selectedIndex
document.form_name.element_name.options[selected_index].value
document.form_name.element_name.options[selected_index].text