HTML = HTML.Replace("&lt;","<");
HTML = HTML.Replace("&gt;",">");
int start,stop;
start = HTML.IndexOf("<img src="http://image2.sina.com.cn/dy/weather/images/figure/",0,HTML.Length);
stop = HTML.IndexOf("<td background=http://image2.sina.com.cn/dy/weather/images",start); 
temp = HTML.Substring(start, stop - start);
}
catch (Exception x)
...{
}
return temp;
}
}