newImage("Untitled", "RGB white", 500, 500, 1);

for( i = 0; i < 100; i++){
   makeRectangle(77, 57, 112, 71);
   //selectWindow("ROI Manager");
   roiManager("Add");
}

for (i=(roiManager("count")-1); i>=0; i--) { 
   roiManager("select", i);
   roiManager("Delete");   
}