var tileSources =  [ //grepmeaway
"osd_37_3.dzi",
"osd_34_3.dzi",
"osd_31_3.dzi",
"osd_29_3.dzi",
"osd_28_3.dzi",
"osd_27_3.dzi",
"osd_26_3.dzi",
"osd_24_3.dzi",
"osd_22_3.dzi",
"osd_20_3.dzi",
"osd_19_3.dzi",
"osd_17_3.dzi",
"osd_14_3.dzi",
"osd_12_3.dzi",
"osd_11_3.dzi",
"osd_7_3.dzi",
"osd_6_3.dzi",
"osd_5_3.dzi",
"osd_3_3.dzi",
]; //grepmeaway