/* define image width and height */

var pic_width=500;
var pic_height=283;

/* define the length of time to stay on each image */ 
/* 1000 = 1 second */

var delay=4000;

/* define image urls */

if (document.images)
 {
     pic1= new Image(pic_width,pic_height);
     pic1.src="http://lawnscience.co.uk/images/css/new-01.jpg";  
     pic2= new Image(pic_width,pic_height); 
     pic2.src="http://lawnscience.co.uk/images/css/new-02.jpg"; 
     pic3= new Image(pic_width,pic_height);
     pic3.src="http://lawnscience.co.uk/images/css/new-03.jpg";  
     pic4= new Image(pic_width,pic_height);
     pic4.src="http://lawnscience.co.uk/images/css/new-04.jpg";  
}    

var pics= new Array(4) 
   pics[0]=pic1.src;
   pics[1]=pic2.src;
   pics[2]=pic3.src;
   pics[3]=pic4.src;


var numpics=4;
var thenum=0;

window.onload = function () {
	setInterval("change_it()",delay);
}

function change_it()
{
	var x=0;
	thenum+=1;

	if (thenum>numpics-1)
	thenum=0;
	
	var changingImage=document.getElementById("changing-image");
	changingImage.setAttribute("src",pics[thenum]);
	x+=1;
}