// �w�i�؂�ւ�
bgc = new Array();
bgc[0] = "url(images/top01.png)";
bgc[1] = "url(images/top02.png)";
bgc[2] = "url(images/top03.png)";
bgc[3] = "url(images/top04.png)";
bgc[4] = "url(images/top05.png)";
bgc[5] = "url(images/top06.png)";
bgc[6] = "url(images/top07.png)";
bgc[7] = "url(images/top08.png)";
bgc[8] = "url(images/top09.png)";
bgc[9] = "url(images/top10.png)";
bgc[10] = "url(images/top11.png)";
bgc[11] = "url(images/top12.png)";
bgc[12] = "url(images/top13.png)";
bgc[13] = "url(images/top14.png)";
bgc[14] = "url(images/top15.png)";
bgc[15] = "url(images/top16.png)";
bgc[16] = "url(images/top17.png)";
bgc[17] = "url(images/top18.png)";
bgc[18] = "url(images/top19.png)";
bgc[19] = "url(images/top20.png)";
n = Math.floor(Math.random()*bgc.length);