这段代码为什么没有反应？

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript">
var picArr=new Array("1.jpg","2.jpg","3.jpg","4.jpg","5.jpg");
var index=0;
function next(){
   index++;
   if(index==picArr.length){
       i=0;
   }
   document.getElementById("ol").src=picArr[index];
}
</script>

</head>
<body>

<img id="ol" src="1.jpg" width="500" height="300"/>
</br>
<input type="button" value="下一张" onclick="next"/>
<input type="button" value="上一张" onclick=""/>
</body>
</html>

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