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img[img.length]="mast_index2.jpg";
img[img.length]="mast_index3.jpg";
img[img.length]="mast_index4.jpg";
img[img.length]="mast_index5.jpg";
img[img.length]="mast_index6.jpg";
img[img.length]="mast_index7.jpg";
img[img.length]="mast_index8.jpg";
img[img.length]="mast_index9.jpg";
img[img.length]="mast_index10.jpg";
img[img.length]="mast_index11.jpg";
img[img.length]="mast_index12.jpg";
img[img.length]="mast_index13.jpg";
img[img.length]="mast_index14.jpg";
img[img.length]="mast_index15.jpg";
img[img.length]="mast_index16.jpg";
img[img.length]="mast_index17.jpg";
img[img.length]="mast_index18.jpg";