var tileSources =  [ //grepmeaway
"osd_75_3.dzi",
"osd_74_3.dzi",
"osd_72_3.dzi",
"osd_70_3.dzi",
"osd_69_3.dzi",
"osd_68_3.dzi",
"osd_65_3.dzi",
"osd_64_3.dzi",
"osd_63_3.dzi",
"osd_61_3.dzi",
"osd_58_3.dzi",
"osd_56_3.dzi",
"osd_55_3.dzi",
"osd_53_3.dzi",
"osd_52_3.dzi",
"osd_50_3.dzi",
"osd_49_3.dzi",
"osd_42_3.dzi",
"osd_41_3.dzi",
"osd_40_3.dzi",
"osd_38_3.dzi",
]; //grepmeaway