var i=1;
function kiss()
{
if(i<document.all.div.length)
{
document.all.div[i-1].style.display="none";
document.all.div[i].style.display="";
i++;
}
}
function kiss()
{
if(i<document.all.div.length)
{
document.all.div[i-1].style.display="none";
document.all.div[i].style.display="";
i++;
}
}
<button onclick="kiss('down')"><<<</button><button onclick="kiss('up')">>>></button><br>
<div id="div" style="position:absolute;"><img src="http://expert.csdn.net/images/csdn.gif"></div>
<div id="div" style="position:absolute;display:none" ><img src="http://65.54.186.24/lgo_msn_113x49.gif"></div>
<div id="div" style="position:absolute;display:none"><img src="http://et.csdn.net/images/001.jpg"></div>
<div id="div" style="position:absolute;display:none"><img src="http://www.dearbook.com.cn/book/images1/smallTS_750831827101top.jpg"></div><script language="JavaScript">
<!--
var i=1;
function kiss(val)
{
if(val == 'up')
{
if(i<document.all.div.length)
{
document.all.div[i-1].style.display="none";
document.all.div[i].style.display="";
if(i<3)
i++;
}
}
else
{
if(i>0)
{
document.all.div[i-1].style.display="";
document.all.div[i].style.display="none";
if(i>1)
i--;
}
}
}
//-->
</script>
</body>