if (document.images) { //preloads the first image
    	img1 = new Image();
    	img1.src = "http://www.ballardrobotics.org/slideshow_files/robot_picture.jpg";
}

var current_slide = 1; //declares the starting slide
var next_slide;
var previous_slide;
var animate = "no";
var mouseover = "no";

function fade_slide() {
  	if (mouseover == "no") {
  		if (current_slide === 6) {next_slide = 1; }
       			else {next_slide = (current_slide + 1); }
	  	$("#slide" + next_slide).show();
	  	$("#slide" + next_slide).css("position", "absolute");
	  	$("#slide" + current_slide).css("position", "absolute");
	  	$("#slide" + current_slide).css("z-index", "1");
	  	$("#slide" + current_slide).fadeOut(1000, function(){	
	  		$("#slide" + current_slide).css("z-index", "0");
	  		$("#slide" + current_slide).css("position", "relative");
		  	$("#slide" + next_slide).css("position", "relative");
  			current_slide = next_slide;
  		});
    	}
}

var int = setInterval('fade_slide()', 6000);



$(document).ready(function() {
	$("div.slideshow").append('<div id="slide1"></div><div id="slide2"></div><div id="slide3"></div><div id="slide4"></div><div id="slide5"></div><div id="slide6"></div>'); //loads all the slides
	$('#slide2').hide(); //hides all slides but the first
	$('#slide3').hide();
	$('#slide4').hide();
	$('#slide5').hide();
	$('#slide6').hide();
	
 	$("div.slideshow").mouseover(function() {
	mouseover = "yes";
	});
	
	$("div.slideshow").mouseout(function() {
	mouseover = "no";
	});
 	
 	$("#right_arrow").click(function(){
 	     if (animate == "no" && mouseover == "yes") {
 	     	animate = "yes";	
 		if (current_slide === 6) {next_slide = 1; }
       			else {next_slide = (current_slide + 1); }
   		$("#slide" + current_slide).css("width", "399px");
   		$("#slide" + next_slide).show();
   		$("#slide" + next_slide).css("float", "right"); 
   		$("#slide" + next_slide).css("marginRight", "-400px");
		$("#slide" + current_slide).animate({marginLeft: '-400px'}, 800);
	    	$("#slide" + next_slide).animate({marginRight: '0px'}, 800, function(){	
    			$("#slide" + current_slide).hide();
    			$("#slide" + current_slide).css("width", "400px");
    			$("#slide" + current_slide).css("margin-left", "0px");
    			$("#slide" + next_slide).css("float", "left");
   		 	current_slide = next_slide;
   		 	animate = "no";
    		});
    	     }
    	});
 	
 	$("#left_arrow").click(function(){
 	     if (animate == "no" && mouseover == "yes") {
 	     	animate = "yes";	
 		if (current_slide === 1) {previous_slide = 6; }
       			else {previous_slide = (current_slide - 1); }
       		$("#slide" + current_slide).css("width", "399px");
       		$("#slide" + current_slide).css("float", "right");
       		$("#slide" + previous_slide).show();
   		$("#slide" + previous_slide).css("margin-left", "-400px");
		$("#slide" + current_slide).animate({marginRight: '-400px'}, 800);
	    	$("#slide" + previous_slide).animate({marginLeft: '0px'}, 800, function(){   		
    			$("#slide" + current_slide).hide();
    			$("#slide" + current_slide).css("width", "400px");
    			$("#slide" + current_slide).css("margin-right", "0px");  
    			$("#slide" + current_slide).css("float", "left"); 			  			
   		 	current_slide = previous_slide;
   		 	animate = "no";
    		});
    	     }
    	});	
});