/* =========================================================

// jquery.innerfade.js

// Datum: 2008-02-14
// Firma: Medienfreunde Hofmann & Baldes GbR
// Author: Torsten Baldes
// Mail: t.baldes@medienfreunde.com
// Web: http://medienfreunde.com

// based on the work of Matt Oakes http://portfolio.gizone.co.uk/applications/slideshow/
// and Ralf S. Engelschall http://trainofthoughts.org/

 *
 *  <ul id="news"> 
 *      <li>content 1</li>
 *      <li>content 2</li>
 *      <li>content 3</li>
 *  </ul>
 *  
 *  $('#news').innerfade({ 
 *	  animationtype: Type of animation 'fade' or 'slide' (Default: 'fade'), 
 *	  speed: Fading-/Sliding-Speed in milliseconds or keywords (slow, normal or fast) (Default: 'normal'), 
 *	  timeout: Time between the fades in milliseconds (Default: '2000'), 
 *	  type: Type of slideshow: 'sequence', 'random' or 'random_start' (Default: 'sequence'), 
 * 		containerheight: Height of the containing element in any css-height-value (Default: 'auto'),
 *	  runningclass: CSS-Class which the container get’s applied (Default: 'innerfade'),
 *	  children: optional children selector (Default: null)
 *  }); 
 *

// ========================================================= */
var slide_interval = null;
var current = 1;
var last = 0;
var settings = {
        			'animationtype':    'fade',
					'speed':            'normal',
					'type':             'sequence',
					'timeout':          2000,
					'containerheight':  'auto',
					'runningclass':     'innerfade',
					'children':         null
        };
var elements = null;

(function($) {

    $.fn.innerfade = function(options) {
        return this.each(function() {   
            $.innerfade(this, options);
        });
    };

    $.innerfade = function(container, options) {
        				
        if (options)
            $.extend(settings, options);
			
        if (settings.children === null)
            elements = $(container).children();
        else
           elements = $(container).children(settings.children);
			
        if (elements.length > 1) {
            $(container).css('position', 'relative').css('height', settings.containerheight).addClass(settings.runningclass);
            
			for (var i = 0; i < elements.length; i++) {
                $(elements[i]).css('z-index', String(elements.length-i)).css('position', 'absolute').hide();
            };

            if (settings.type == "sequence") {
               if(settings.timeout > 0) {	
			   			slide_interval =  setInterval(	function() 	{
																	$.innerfade.gonext();
														}, settings.timeout);
			   }
			   
			   $(elements[0]).show();
            } else if (settings.type == "random") {
				var last = Math.floor ( Math.random () * ( elements.length ) );
				slide_interval =  setInterval(function() {
									do { 
											current = Math.floor ( Math.random ( ) * ( elements.length ) );
									} while (last == current );             
									$.innerfade.gonext();
									}, settings.timeout);
				
				$(elements[last]).show();
			
			} else if ( settings.type == 'random_start' ) {
				settings.type = 'sequence';
				current = Math.floor ( Math.random () * ( elements.length ) );
				setTimeout(function(){
										$.innerfade.next(elements, settings, (current + 1) %  elements.length, current);
									}, settings.timeout);
				$(elements[current]).show();
			}	else {
				alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
			}
		}
    };

	$.innerfade.updateUI = function(elements, settings, current, last) {
		//imposto la didascalia...
		$('#dida').hide();
		setDidascalia($(elements[current]).find('img').attr('ref'));
		$('#dida').fadeIn();
		
		//se ci sono degli elementi quadratini...
		last_v_img = '#img_row_'+current;
		
		
		$('#img_row_'+last).removeClass('img_selected');
		$('#img_row_'+current).addClass('img_selected');
		
        if (settings.animationtype == 'slide') {
            $(elements[last]).slideUp(settings.speed);
            $(elements[current]).slideDown(settings.speed);
        } else if (settings.animationtype == 'fade') {
            $(elements[last]).fadeOut(settings.speed);
            $(elements[current]).fadeIn(settings.speed, function() {
							removeFilter($(this)[0]);
						});
        } else
            alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
			
	}
	$.innerfade.clicked_gonext = function() {
		$.innerfade.goToImage(current--);
	}
	$.innerfade.clicked_goprev = function() {
		$.innerfade.goToImage(current++);
	}
    $.innerfade.gonext = function() {
		
		//aggiorno dida e tasselli
		$.innerfade.updateUI(elements, settings, current, last);
		
		if (settings.type == "sequence") {
            if ((current + 1) < elements.length) {
                current = current + 1;
                last = current - 1;
            } else {
                current = 0;
                last = elements.length - 1;
            }
        } else if (settings.type == "random") {
            last = current;
            while (current == last)
                current = Math.floor(Math.random() * elements.length);
        } else
            alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
		
	}
	$.innerfade.goprev = function() {
		//aggiorno dida e tasselli
		$.innerfade.updateUI(elements, settings, current, last);
		
		if (settings.type == "sequence") {
            if (current > 0) {
				current = current - 1;
                last = current + 1;
            } else {
                current = elements.length - 1;
                last = 0;
            }
        } else if (settings.type == "random") {
            last = current;
            while (current == last)
                current = Math.floor(Math.random() * elements.length);
        } else
            alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
	}
	$.innerfade.goToImage = function(n) {
		current = n;
		
		if(n>0)
			last = current - 1;
		else
			last = elements.length - 1;
			
		//aggiorno dida e tasselli
		$.innerfade.updateUI(elements, settings, current, last);
		
		if (settings.type == "sequence") {
            if (current > 0) {
				current = current - 1;
                last = current + 1;
            } else {
                current = elements.length - 1;
                last = 0;
            }
        } else if (settings.type == "random") {
            last = current;
            while (current == last)
                current = Math.floor(Math.random() * elements.length);
        } else
            alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
	}
    $.innerfade.stopSlide = function() {
		clearInterval(slide_interval);
	}
	
})(jQuery);

// **** remove Opacity-Filter in ie ****
function removeFilter(element) {
	if(element.style.removeAttribute){
		element.style.removeAttribute('filter');
	}
}