var tileSources =  [ //grepmeaway
"osd_74_3.dzi",
"osd_73_3.dzi",
"osd_72_3.dzi",
"osd_71_3.dzi",
"osd_70_3.dzi",
"osd_68_3.dzi",
"osd_67_3.dzi",
"osd_66_3.dzi",
"osd_65_3.dzi",
"osd_64_3.dzi",
"osd_63_3.dzi",
"osd_62_3.dzi",
"osd_61_3.dzi",
"osd_60_3.dzi",
"osd_18_3.dzi",
"osd_17_3.dzi",
"osd_16_3.dzi",
"osd_15_3.dzi",
]; //grepmeaway