function showImg(base_url)
{
        return function() {
                var d = new Date();
                var i = 0;
                var img_url = base_url;
                
                if (d.getUTCMinutes() < 5) { // 至少等5分鍾，才使用新的衛星雲圖
                        i=1; 
                }
                d.setUTCHours(d.getUTCHours() + 8 - i); // trick : 變成台灣的時區
                var tmp = d.getUTCFullYear();
                if (tmp < 10) {
                        img_url += "0";
                }
                img_url += tmp;
                img_url +="-";
                if (d.getUTCMonth() + 1 < 10) {
                        img_url += "0";
                }
                img_url += (d.getUTCMonth() + 1);
                img_url +="-";
                if (d.getUTCDate() < 10) {
                        img_url += "0";
                }
                img_url += (d.getUTCDate());
                img_url +="-";
                
                if (d.getUTCHours() < 10) {
                        img_url += "0";
                }
                img_url += (d.getUTCHours());
                img_url +="-";


/*                if (d.getUTCMinutes() < 30 + 5) {*/
                        img_url += "00";
/*                } else {
                        img_url += "30";
                }*/
                
                img_url += ".jpg";
                return img_url;  
        }
}

s3q = showImg("http://www.cwb.gov.tw/V6/observe/satellite/Data/s3q/s3q-"); // 台灣氣象雲圖
s1q = showImg("http://www.cwb.gov.tw/V6/observe/satellite/Data/s1q/s1q-"); // 東亞氣象雲圖