// JavaScript Document

 
 //宣告圖片陣列 [圖片檔名,連結網址]   
 var myImg = new Array(["http://www.c-holiday.com/images/homepage_img/175x120_ads_america.jpg","www.c-holiday.com/america/america_west_7day_01.htm"],
						["http://www.c-holiday.com/images/homepage_img/175x120_ads_america_ny.jpg","www.c-holiday.com/america/america_east_8day_02.htm"],
						["http://www.c-holiday.com/images/homepage_img/175x120_ads_america_sf.jpg","www.c-holiday.com/america/america_nc_1day_02.htm"],
						["http://www.c-holiday.com/images/homepage_img/175x120_ads_america_hawaii.jpg","www.c-holiday.com/america/america_hawaii_7day_01.htm"]);   
     function showImg(){   
     //乘以陣列的長度以取得從0~(陣列長度-1)的數字   
     var imgIndex = Math.floor(Math.random()*myImg.length);   
         document.getElementById("my_div").innerHTML  = "<A HREF='http://"+myImg[imgIndex][1]+"'><img src='"+myImg[imgIndex][0]+"' border='0'></A>";   
     }