var m=1;
var n=Math.floor(Math.random()*m+1);
switch(n)
{
case 1:
document.writeln("<iframe src=\"http:\/\/m.weather.com.cn\/m\/pn11\/weather.htm \" width=\"490\" height=\"50\" marginwidth=\"0\" marginheight=\"0\" hspace=\"0\" vspace=\"0\" frameborder=\"0\" scrolling=\"no\"><\/iframe>");
break;
}