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

// 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)
 *  }); 
 *

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


(function($) {

    var gTimeout = null;
    var gPaused = false;
    var gCurrent = 1;
    var gLast = 0;
    var gSettings;
    var gElements;
    $.fn.innerfade = function(options) {
        return this.each(function() {   
            $.innerfade(this, options);
        });
    };
    $.innerfade = function(container, options) {
        var settings = {
        		'animationtype':    'fade',
            'speed':            'normal',
            'type':             'sequence',
            'timeout':          2000,
            'containerheight':  'auto',
            'runningclass':     'innerfade',
            'children':         null,
            'hascontrols':		false
        };
        if (options)
            $.extend(settings, options);
        if (settings.children === null)
            var elements = $(container).children();
        else
            var elements = $(container).children(settings.children);
		gElements = elements;
		gSettings = settings;
        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(!gPaused) {
                	gTimeout = setTimeout(function() {
                	    $.innerfade.next();
                		}, settings.timeout);
				}
                $(elements[0]).show();
            } else if (settings.type == "random") {
            		gLast = Math.floor ( Math.random () * ( elements.length ) );	
            		if(!gPaused) {
						gTimeout = setTimeout(function() {
							do { 
								gCurrent = Math.floor ( Math.random ( ) * ( elements.length ) );
							} while (gLast == gCurrent );             
							$.innerfade.next();
                		}, settings.timeout);
					}
                $(elements[last]).show();
						} else if ( settings.type == 'random_start' ) {
								gSettings.type = 'sequence';
								gCurrent = Math.floor ( Math.random () * ( elements.length ) );
								gLast = (current + 1) %  elements.length;
								if(!gPaused) {
									gTimeout = setTimeout(function(){
										$.innerfade.next();
									}, settings.timeout);
								}
								$(elements[current]).show();
						}	else {
							alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
						}
				}


		if(gSettings.hascontrols) {
			// pause
			$("#slideshow_controls input.stop-button").bind('click', function(){    
				clearTimeout(gTimeout);
				gPaused = true;
			});
			$("#slideshow_controls input.play-button").bind('click', function(){    
				if(gPaused) {
					gPaused = false;
					$.innerfade.next();
				}
			});

			// next
			$("#slideshow_controls input.next-button").bind('click', function() {
				clearTimeout(gTimeout);		
				if ((gCurrent + 1) < elements.length) {
					gCurrent = gCurrent + 1;
					gLast = gCurrent - 1;
				} else {
					gCurrent = 0;
					gLast = elements.length - 1;
				}				
				$.innerfade.next();
			});

			// previous
			$("#slideshow_controls input.previous-button").bind('click', function() {
				clearTimeout(gTimeout);	
				if (gCurrent == 0) {
					gLast = 0;
					gCurrent = elements.length - 1;
				} else {
					gLast = gCurrent;
					gCurrent = gCurrent - 1;
				}					
				$.innerfade.next();		
			});

			// goto
			$("#slideshow_controls select.goto").bind('change', function() {
				clearTimeout(gTimeout);
				gLast = gCurrent;
				gCurrent = this.selectedIndex;
				$.innerfade.next();		
			});

		}       				
				
    };

    $.innerfade.next = function() {
		var elements = gElements;
		var settings = gSettings;
		var current = gCurrent
		var last = gLast;
		$("#slideshow_controls select.goto")[0].selectedIndex = gCurrent;
        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\'');
        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\'');
            
		if(!gPaused) {
			gTimeout = setTimeout((function() {
				$.innerfade.next();
				gCurrent = current;
				gLast = last;
			}), settings.timeout);
		}
    };

})(jQuery);

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