/*
 * jQuery Slideshow Plugin v1.3
 * Author: Matt Oakes
 * URL: http://www.matto1990.com/jquery/slideshow/
 *
 * Modifications by Meinhard Benn (http://benn.org/):
 *  - fadetime setting
 */

jQuery.fn.slideshow = function(options) {
	var settings = {
		fadetime: 1500,
		/* fadetime: 'slow', */
		timeout: '2000',
		type: 'sequence',
		pauselink: null,
		playcallback: null,
		pausecallback: null
	};
	if (options) {
		jQuery.extend(settings, options);
	}
	
	var	pauseState = 0,
	    firstTime = 1;
		current = 0,
		last = -1,
		timer = '';
		
	var change = function () {
		if ( pauseState == 0 ) 
		{
			for (var i = 0; i < slides.length; i++) 
			{
				jQuery(slides[i]).css('display', 'none');
			}
			if ( last >= 0 )
			{
			     jQuery(slides[last]).fadeOut(settings.fadetime);
			}
			//jQuery(slides[last]).css('zIndex', '0');
			jQuery(slides[current]).fadeIn(settings.fadetime);
			//jQuery(slides[current]).css('zIndex', '1').fadeIn(settings.fadetime);
			
			if ( settings.type == 'sequence' ) 
			{
			     last = current;
			     current = ( current >= slides.length - 1 ) ? 0 : current + 1;
			}
			else if ( settings.type == 'random' ) 
			{
				last = current;
				while (	current == last ) {
					current = Math.floor ( Math.random ( ) * ( slides.length ) );
				}
			}
			else 
			{
				alert('type must either be \'sequence\' or \'random\'');
			}
			
			timer = setTimeout(change, settings.timeout);
		}
	};
	
	var pause = function() 
	{
		if ( pauseState == 0 ) 
		{
			pauseState = 1;
			clearTimeout(timer);
			if ( settings.playcallback != null ) 
			{
				settings.pausecallback(jQuery('#' + settings.pauselink));
			}
		}
		else 
		{
			pauseState = 0;
			change();
			if ( settings.playcallback != null ) 
			{
				settings.playcallback(jQuery('#' + settings.pauselink));
			}
		}
		return false;
	};
	
	this.css('position', 'relative');
	var slides = this.find('.slide').get();
	jQuery.each(slides, function(i)
	{
		//jQuery(slides[i]).css('zIndex', slides.length - i).css('position', 'absolute').css('top', '0').css('left', '0');
		//jQuery(slides[i]).css('position', 'absolute').css('top', '0').css('left', '0');
	});
	
	if ( settings.type == 'sequence' ) 
	{
	    if ( firstTime )
	    {
	       firstTime = 0;
	       change();
	    }
		timer = setTimeout(change, settings.timeout);
	}
	else if ( settings.type == 'random' ) 
	{
		do 
		{
			current = Math.floor ( Math.random ( ) * ( slides.length ) );
		} 
		while ( current == 0 );
		timer = setTimeout(change, settings.timeout);
	}
	else 
	{
		alert('type must either be \'sequence\' or \'random\'');
	}
	
	if ( settings.pauselink != null ) 
	{
		jQuery('#' + settings.pauselink).click(pause);
	}

	return this;
};