select box validation

Trying to validate a select box field using the below code 

	if ($('#micolabel').val() > 0)
		{
			saveButton.evolutionValidation('addField', '#micolabel',
				{
					required: true,
					messages: { required: context.subjectRequiredText }
				},
				'#' + context.wrapperId + ' .field-item.post-label .field-item-validation'
			);
		}

for 

<li class="field-item post-label">
<label for="$core_v2_widget.UniqueId('Labels')" class="field-item-name">$core_v2_language.GetResource('CreateEditPost_Labels')</label>
    <span class="field-item-input">
        <select name="" id="micolabel">
        </select>
    </span>
 <span class="field-item-validation" style="display: none;"></span>
 </li>

But no luck. Any suggestions? 

Also, how to validate the checkboxes ?