
(function($){
	
	$.fn.slider = function(options) {

		// set default options
		var defaults = {
			speed : 1000,
			pause : 2000,
			transition : 'fade',
			twitter: false
		},

		// Take the options that the user selects, and merge them with defaults.
		options = $.extend(defaults, options);
		
		// Needed to fix a tiny bug. If the pause is less than speed, it'll cause a flickr.
		// This will check for that, and if it is smaller, it increases it to just about the options.speed.
		if(options.pause <= options.speed) options.pause = options.speed + 100;
	
		// for each item in the wrapped set
		return this.each(function() {
		
			// cache "this."
			var $this = $(this);
			
			// Wrap "this" in a div with a class of "slider-wrap."
			$this.wrap('<div class="slider-wrap" />');
			
			// Set the width to a really high number. Adjusting the "left" css values, so need to set positioning.
			

			// If the user chose the "slide" transition...
			if(options.transition === 'slide') {
				
				$this.css({
					'width' : '99999px',
					'position' : 'relative',
					'padding' : 0
				});
				
				$this.children().css({
					'float' : 'left',
					'list-style' : 'none',
				});
				
				$this.parent().css({
					'width' : $this.children().width(),
					'overflow' : 'hidden'
				});				
			}
			
			// If the user chose the "fade" transition, instead pile all of the images on top of each other.
			if(options.transition === 'fade') {
				
				$this.children().css({
					'width' : $this.find('img').width(),
					'position' : 'absolute',
					'left' : 0
				});
				
				$this.css({
					'width' : $this.find('img').width(),
					'height' : $this.find('img').height(),
					'position' : 'relative',
					'padding' : 0,
					 'margin': 0
				});
				
				$this.parent().css({
					'width' : $this.width(),
					'overflow' : 'hidden'
				});	
				
			
				
				// reorder elements to fix z-index issue.
				
				for(var i = $this.children().length, y = 0; i > 0; i--, y++) { 		
					$this.children().eq(y).css('zIndex', i + 99999);
				}	

				// Call the fade function. 
				fade();
			}
			
			// If the user instead chose the "slide" transition, call the slide function.
			if(options.transition === 'slide') slide();	
			
			
			function slide() {
				setInterval(function() {
					// Animate to the left the width of the image/div
					$this.animate({'left' : '-' + $this.parent().width()}, options.speed, function() {
						// Return the "left" CSS back to 0, and append the first child to the very end of the list.
						$this
						   .css('left', 0)
						   .children(':first')
						   .appendTo($this); // move it to the end of the line.
					});
				}, options.pause);
			} // end slide

			function fade() {
				setInterval(function() {
					$this.children(':first').animate({'opacity' : 0}, options.speed, function() {	
						$this
						   .children(':first')
						   .css('opacity', 1) // Return opacity back to 1 for next time.
						   .css('zIndex', $this.children(':last').css('zIndex') - 1) // Reduces zIndex by 1 so that it's no longer on top.					
						   .appendTo($this); // move it to the end of the line.
					});
				}, options.pause);
			} // end fade	
			
			

		}); // end each		
	
	}; // End plugin. Go eat cake.
	
})(jQuery);
