void delN(){
		int maxDelete;
		if(slice == 1)
			maxDelete = numSlices - 1;
		else
			maxDelete = numSlices - slice + 1;
		int nDelete = 1;
		if(maxDelete>1){
			nDelete = maxDelete+1;
			while((nDelete > maxDelete)||(nDelete < 0 )){
				nDelete = (int)IJ.getNumber("Number of slices to delete (max "+maxDelete+")",1);
				if(nDelete==IJ.CANCELED)return;
				if((nDelete > maxDelete)||(nDelete < 0 ))IJ.beep();
			}
		}
		if(nDelete==0)return;
		for(int i = 0; i < nDelete; i++){
			del();
		}

	}