var r = 0;

// Set array of images.
var imageArray = new Array();
imageArray[0] = "svcpromo_emergency.jpg";
imageArray[1] = "svcpromo_lifecenter.jpg";
imageArray[2] = "svcpromo_sleepcenter.jpg";
imageArray[3] = "svcpromo_maternity.jpg";

var linkArray = new Array();
linkArray[0] = "svc_emergency.htm";
linkArray[1] = "svc_lifecenter_main.htm";
linkArray[2] = "svc_sleepcenter.htm";
linkArray[3] = "svc_family_place.htm";

// Type the number of images you are rotating.
var NumberOfImagesToRotate = 4;

// Specify the first and last part of the href.
linkFirstPart = '<a href="';
linkEndPart = '">';
linkClosePart = '</a>';

// Specify the first and last part of the image tag.
imageFirstPart = '<img src="images/';
imageLastPart = '" border="0">';

function randomImage() {
	r = Math.ceil(Math.random() * NumberOfImagesToRotate);
	r = r-1;
	printImage(imageArray[r], linkArray[r]);
}

function changeImage(step) {
	if(step == "next"){
		if(r == NumberOfImagesToRotate-1){
			r = 0;
		}else{
			r = r+1;
		}
	}else{
		if(r == 0){
			r = NumberOfImagesToRotate-1;
		}else{
			r = r-1;
		}
	}
	
	printImage(imageArray[r], linkArray[r]);
}

function printImage(image, href) {
	document.getElementById('svcPromoContentContainer').innerHTML = linkFirstPart + href + linkEndPart + imageFirstPart + image + imageLastPart + linkClosePart;
}