How to set value of checkbox in magento custom module

Question

How do I set the value of a checkbox in a magento custom module? Also, how do I set the name of the checkbox to the value in an array?

Here is the code I use to put

Answer 1

values (ending with 's') is for a select field: try value (singular)
sorry about that, try this instead:
Assuming $entity is the object you're working with, after the $fieldset declaration:

$entity->setData('assign_color_new[]', $entity_id['colorcode']);

Check out Mage_Adminhtml_Block_Customer_Edit_Tab_Account (line 142) to see how the core do it.