var tileSources =  [ //grepmeaway
"osd_29_3.dzi",
"osd_27_3.dzi",
"osd_23_3.dzi",
"osd_22_3.dzi",
"osd_20_3.dzi",
"osd_19_3.dzi",
"osd_17_3.dzi",
"osd_16_3.dzi",
]; //grepmeaway