var temp = Math.random();
var url = "";
temp = temp*1;
if (temp >1 ){
url = '<a href="http://www.flyplus.net" target="_black"><img src="http://www.flyplus.net/images/flyplus.gif" border="0" alt="飞行新人类"></a>';
document.write(url);
}
if (temp <2 && temp >1 ){
url = '<a href="http://www.flying-man.com" target="_black"><img src="http://www.flyplus.net/images/flyingman.gif" border="0" alt="北京飞人天地滑翔伞俱乐部"></a>';
document.write(url);
}
if (temp <3 && temp >2 ){
url = '<a href="http://www.gliding.org.cn/" target="_black"><img src="http://www.flyplus.net/images/hualian.gif" border="0" alt="北京华联航空俱乐部"></a>';
document.write(url);
}
if (temp <4 && temp >3 ){
url = '<a href="http://www.flyplus.net" target="_black"><img src="http://www.flyplus.net/images/flyplus.gif" border="0" alt="飞行新人类"></a>';
document.write(url);
}