var tileSources =  [ //grepmeaway
"osd_20_3.dzi",
"osd_19_3.dzi",
"osd_18_3.dzi",
"osd_17_3.dzi",
"osd_16_3.dzi",
"osd_13_3.dzi",
"osd_11_3.dzi",
"osd_8_3.dzi",
"osd_7_3.dzi",
"osd_6_3.dzi",
"osd_5_3.dzi",
"osd_4_3.dzi",
"osd_3_3.dzi",
"osd_2_3.dzi",
"osd_1_3.dzi",
"osd_0_3.dzi",
]; //grepmeaway