$imgsize = getimagesize($targpath);
  $oldwidth = $imgsize[0];
  $oldheight = $imgsize[1];
  var_dump($oldwidth);
  var_dump($oldheight);
if($oldheigth > $oldwidth){
  $nw =(640*$oldwidth)/$oldheight;
  $nh = 640;
  $thumbnw =(160*$oldwidth)/$oldheight;
  $thumbnh = 160;
  }
if($oldwidth > $oldheight){
  $nh=(480*$oldheight)/$oldwidth;
  $nw = 480;
  $thumbnh=(120*$oldheight)/$oldwidth;
  $thumbnw = 120;
  }
if($oldwidth == $oldheight){
  $nh = 480;
  $nw = 480;
  $thumbnh= 120;
  $thumbnw = 120;
  }