用javascript做点击“下页”/“上页”在本htm内变化图片的图象浏览功能？

1<img id="k" onclick="c()" src="0.gif"/>

 1<script>   
 2var img=new Array();   
 3var i=0;   
 4  
 5img[0]='1.gif'   
 6img[1]='2.gif'   
 7img[2]='3.gif'   
 8function c(){   
 9(i<img.length-1)?i++:i=0;   
10k.src=img[i]   
11}   
12</script>

1<img id="k" onclick="c()" src="0.gif"/>

 1<script>   
 2var img=new Array();   
 3var i=0;   
 4  
 5img[0]='1.gif'   
 6img[1]='2.gif'   
 7img[2]='3.gif'   
 8function c(){   
 9(i<img.length-1)?i++:(img.length-1);   
10k.src=img[i]   
11}   
12</script>