var tileSources =  [ //grepmeaway
"osd_37_3.dzi",
"osd_36_3.dzi",
"osd_35_3.dzi",
"osd_34_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_24_3.dzi",
"osd_23_3.dzi",
"osd_22_3.dzi",
"osd_21_3.dzi",
"osd_20_3.dzi",
"osd_19_3.dzi",
]; //grepmeaway