var tileSources =  [ //grepmeaway
"osd_45_3.dzi",
"osd_44_3.dzi",
"osd_42_3.dzi",
"osd_41_3.dzi",
"osd_40_3.dzi",
"osd_39_3.dzi",
"osd_38_3.dzi",
"osd_37_3.dzi",
"osd_33_3.dzi",
"osd_32_3.dzi",
"osd_31_3.dzi",
"osd_30_3.dzi",
"osd_29_3.dzi",
"osd_28_3.dzi",
"osd_27_3.dzi",
"osd_26_3.dzi",
"osd_25_3.dzi",
"osd_23_3.dzi",
]; //grepmeaway