Set classes to form labels depending on (child) input type. (Taken from StarGazer wordpress theme by Justin Tadlock.)

form label classes.js

	/*
	 * Adds classes to the `<label>` element based on the type of form element the label belongs 
	 * to. This allows theme devs to style specifically for certain labels (think, icons).
	 */

	jQuery( '#container input, #container textarea, #container select' ).each(

		function() {
			var sg_input_type = 'input';
			var sg_input_id   = jQuery( this ).attr( 'id' );
			var sg_label      = '';

			if ( jQuery( this ).is( 'input' ) )
				sg_input_type = jQuery( this ).attr( 'type' );

			else if ( jQuery( this ).is( 'textarea' ) )
				sg_input_type = 'textarea';

			else if ( jQuery( this ).is( 'select' ) )
				sg_input_type = 'select';

			jQuery( this ).parent( 'label' ).addClass( 'label-' + sg_input_type );

			if ( sg_input_id )
				jQuery( 'label[for="' + sg_input_id + '"]' ).addClass( 'label-' + sg_input_type );

			if ( 'checkbox' === sg_input_type || 'radio' === sg_input_type ) {
				jQuery( this ).parent( 'label' ).removeClass( 'font-secondary' ).addClass( 'font-primary' );
			}
		}
	);