( function( $ ) {
 
	// plugin definition
	$.fn.overlabel = function( options ) {
	
		// build main options before element iteration
		var opts = $.extend( {}, $.fn.overlabel.defaults, options );
		
		var selection = this.filter( 'label[for]' ).map( function() {
		
			var label = $( this );
			var id = label.attr( 'for' );
			var field = document.getElementById( id );
			
			if ( !field ) return;
			
			// build element specific options
			var o = $.meta ? $.extend( {}, opts, label.data() ) : opts;
			
			label.addClass( o.label_class );
			
			var hide_label = function() { label.css( o.hide_css ) };
			var show_label = function() { this.value || label.css( o.show_css ) };
			
			$( field )
				.parent().addClass( o.wrapper_class ).end()
				.focus( hide_label ).blur( show_label ).each( hide_label ).each( show_label );
			
			return this;
		
		} );
		
		return opts.filter ? selection : selection.end();
	};
	
	// publicly accessible defaults
	$.fn.overlabel.defaults = {
	
			label_class:   'overlabel-apply',
			wrapper_class: 'overlabel-wrapper',
			hide_css:      { 'display': 'none' },
			show_css:      { 'display': 'block', 'cursor': 'text' },
			filter:        false
	
	};
 
} )( jQuery );