var tileSources =  [ //grepmeaway
"osd_56_3.dzi",
"osd_55_3.dzi",
"osd_54_3.dzi",
"osd_52_3.dzi",
"osd_51_3.dzi",
"osd_50_3.dzi",
"osd_49_3.dzi",
"osd_48_3.dzi",
"osd_47_3.dzi",
"osd_45_3.dzi",
"osd_44_3.dzi",
"osd_43_3.dzi",
"osd_42_3.dzi",
"osd_41_3.dzi",
"osd_40_3.dzi",
"osd_39_3.dzi",
"osd_38_3.dzi",
"osd_20_3.dzi",
"osd_19_3.dzi",
]; //grepmeaway