var myImg= new Array(3)
  myImg[0]= "casestudypepsi";
  myImg[1]= "casestudypepsi2";
  myImg[2]= "casestudypepsi3";
  myImg[3]= "casestudypepsi4";

var step = new Array(2)
	step[0]= "1";
	step[1]= "2";
	step[2]= "3";
	step[3]= "4";

var myImgSrc = "http://dev.qwikker/images/temp/";

var myImgEnd = ".jpg"

var imageIndex = 0;

function loadImg(){	
  //alert(i);
	alert(myImgSrc + myImg[i] + myImgEnd);
	alert(document.getElementById('imgSrc'));
	//document.imgSrc.src = myImgSrc + myImg[i] + myImgEnd;
	document.getElementById('imgSrc').src = myImgSrc + myImg[i] + myImgEnd;
	//alert (document.getElementById('imgSrc').src);
  
}

function prev(){
  if(imageIndex <= 0){
	  imageIndex = 3;
  } else {
	  imageIndex--;
  }
  document.getElementById('imgSrc').src = myImgSrc + myImg[imageIndex] + myImgEnd;
  document.getElementById('step').innerHTML = step[imageIndex];
}

function next(){
   if(imageIndex>2){
	imageIndex = 0;
  } else {
	  imageIndex++;
  }
  document.getElementById('imgSrc').src = myImgSrc + myImg[imageIndex] + myImgEnd;
  document.getElementById('step').innerHTML = step[imageIndex];
}

//window.onload=loadImg();