( 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;

				if ((label.attr('class') == 'undefinded') || (label.attr('class').search(/overlabel-applytopPopup/) == -1) )
				{
					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:      { 'text-indent': '-10000px' },
        show_css:      { 'text-indent': '0px', 'cursor': 'text' },
        filter:        false

    };

} )( jQuery );