if(width>height) {
                    ff=(height/width); xo=0; yo=((ww*ff)-hh)/2; hh=(ww*ff); yo=(yo/(hh/100));
                }else if(width<height) {
                    ff=(width/height); yo=0; xo=((hh*ff)-ww)/2; ww=(hh*ff); xo=(xo/(ww/100));
                }else {