i_yr=0;
yrcreate2();

function yrcreate2()
{
i_yr=i_yr%3;
switch (i_yr)
{

case 0 :
	recommend2.innerHTML="<a href='http://www.sdtv.com.cn/news/guoqing60/Index.htm' target='_blank'><img src='http://www.sdtv.com.cn/images/2009/guoqing60.jpg' width=780 height=100 border=0></a>";
	break;
case 1 :
	recommend2.innerHTML="<a href='http://www.sdtv.com.cn/sports/quanyun/' target='_blank'><img src='http://www.sdtv.com.cn/news/images/11yun.jpg' width=780 height=100 border=0></a>";
	break;    

} //end swhich i
i_yr++;
}

setInterval("yrcreate2()",3000);//Ñ­»·²¥·Å

<!--
//case 0 :
	//recommend2.innerHTML="<a href='http://www.sdtv.com.cn/sports/olympic/Index.htm' target='_blank'><img src='http://www.sdtv.com.cn/images-2008/ad-oly2.jpg' width=780 height=100 border=0></a>";
	//break;

	-->