<script type="text/javascript">
	function reloadcode(){
		var verify=document.getElementById('safecode');
		verify.setAttribute('src','image.jsp?'+Math.random());
		//这里必须加入随机数不然地址相同我发重新加载
	}

</script>

HTML:

<img id="safecode" border="0" onclick="reloadcode()" src="image.jsp">