var tileSources =  [ //grepmeaway
"osd_64_3.dzi",
"osd_63_3.dzi",
"osd_62_3.dzi",
"osd_61_3.dzi",
"osd_60_3.dzi",
"osd_59_3.dzi",
"osd_58_3.dzi",
"osd_57_3.dzi",
"osd_56_3.dzi",
"osd_54_3.dzi",
"osd_53_3.dzi",
"osd_52_3.dzi",
"osd_51_3.dzi",
"osd_50_3.dzi",
"osd_49_3.dzi",
"osd_45_3.dzi",
"osd_44_3.dzi",
"osd_21_3.dzi",
"osd_20_3.dzi",
"osd_18_3.dzi",
"osd_17_3.dzi",
"osd_16_3.dzi",
"osd_12_3.dzi",
"osd_11_3.dzi",
"osd_10_3.dzi",
"osd_9_3.dzi",
"osd_8_3.dzi",
"osd_6_3.dzi",
]; //grepmeaway