function rmspan(arg){
	var span = document.getElementById(arg);
	//span.innerHTML="<img src=http://changku.cn/year/2012.jpg />";
span.style.display='none';
}

function times(){
    //setTimeout("rmspan('adimage')",20000)
	setTimeout("rmspan('swfimage')",15000)
}
function showTopImg()
{	
	document.write('<div align="center" id="swfimage"><img src=http://changku.cn/year/2012.jpg /></div>');
	//document.write('<div align="center" id="swfimage" style="display:none"><img src=http://changku.cn/year/2012.jpg /></div>');
}
showTopImg();
times();