var num = 100
var ran = Math.random();
var target = parseInt(ran*num)+1;

var img1 = "mid_pic/home_pic_01.jpg" // ブラピ1
var img2 = "mid_pic/home_pic_02.jpg" // ブラピ2
var img3 = "mid_pic/home_pic_03.jpg" // インドネシア洪水
var img4 = "mid_pic/home_pic_04.jpg" // デフォルト
var img5 = "mid_pic/home_pic_05.jpg" // 花見1
var img6 = "mid_pic/home_pic_06.jpg" // 花見2
var img7 = "mid_pic/home_pic_07.jpg" // 花見3
var img8 = "mid_pic/home_pic_08.jpg" // バングラデッシュ洪水
var img9 = "mid_pic/home_pic_09.jpg" // Blobal Build in India
var img10 = "mid_pic/home_pic_10.jpg" // JRCWP
var img11 = "mid_pic/home_pic_11.jpg" // フィリピン洪水被害
var img12 = "mid_pic/home_pic_091207.jpg" // カーターワークプロジェクト09 閉幕
var img13 = "mid_pic/home_pic_100119.jpg" // ハイチ地震
var img14 = "images/rnd_catch/rndCatch_100201_1.jpg" // ハイチ地震2
var img15 = "images/rnd_catch/rndCatch_100201_2.jpg" // ハイチ地震3
var img16 = "images/rnd_catch/rndCatch_100201_3.jpg" // ハイチ地震4
var img17 = "images/rnd_catch/rndCatch_100418.jpg" // BlueSkyBuild2010
var img18 = "images/rnd_catch/rndC_100614_1.jpg" // EVEREST1
var img19 = "images/rnd_catch/rndC_100614_2.jpg" // EVEREST2

var Link1 = "" // ブラピ１
var Link2 = "http://www.habitatjp.org/jpblog/2010/01/post_163.html" // ハイチ地震
var Link3 = "http://www.habitatjp.org/jpblog/2009/11/_09_1120.html" // カーターワークプロジェクト09 閉幕
var Link4 = "http://www.habitatjp.org/jpblog/2010/06/_501038.html" // EVEREST
var Link5 = "http://www.habitatjp.org/jpblog/2010/04/30blue_sky_build.html" // BlueSkyBuild2010


var URL1 = "<a href='" + Link3 + "'><img src='" + img12 + "' border='0'></a>";
var URL2 = "<a href='" + Link2 + "'><img src='" + img14 + "' border='0'></a>";
var URL3 = "<a href='" + Link2 + "'><img src='" + img15 + "' border='0'></a>";
var URL4 = "<a href='" + Link2 + "'><img src='" + img16 + "' border='0'></a>";
var URL5 = "<a href='" + Link4 + "'><img src='" + img18 + "' border='0'></a>";
var URL6 = "<a href='" + Link4 + "'><img src='" + img19 + "' border='0'></a>";

if ((target >= 1) && (target <= 10)) { document.write(URL1) };
if ((target >= 11) && (target <= 20)) { document.write(URL2) };
if ((target >= 21) && (target <= 30)) { document.write(URL3) };
if ((target >= 31) && (target <= 40)) { document.write(URL4) };
if ((target >= 41) && (target <= 70)) { document.write(URL5) };
if ((target >= 71) && (target <= 100)) { document.write(URL6) };