var how_many_ads = 2;
//¼ýÀÚ´Â º£³ÊÀÇ ¼ö¸¸Å­.. 
var now = new Date() 
var sec = now.getSeconds() 
var ad = sec % how_many_ads; 
ad +=1; 

if (ad==1) { 
url="http://www.aten.co.kr/CM0264_Product%20Page_Source/html/index.html"; 
alt="2x4 DVI-HDMI ¸ÅÆ®¸¯½º KVMP¢â ½ºÀ§Ä¡"; 
banner="images/banner_cm0264.jpg"; 
width="365"; 
height="200"; 
} 
else if (ad==2) { 
url="http://www.aten.co.kr/MediaDistribution_2/index.html";  
banner="images/mdsolution2.jpg"; 
alt="ATEN ¹Ìµð¾î ºÐ¹è ¼Ö·ç¼Ç »ó¼¼º¸±â"; 
width="365"; 
height="200"; 
} 



document.write('<a href=\"' + url + '\" target=\"_blank\">'); 
document.write('<img src=\"' + banner + '\" width=\"' + width + '\" height=\"' + height + '\" ') 
document.write('alt=\"' + alt + '\" border=0></a>');