function doHeight(){
  if (screen.height == 480)
  {
   var pheight=145;
  }
  else if (screen.height == 600)
  {
   var pheight=300;
  }
  else if (screen.height == 768)
  {
   var pheight=467;
  }
  else if (screen.height == 864)
  {
   var pheight=580;
  }
  else if (screen.height == 1024)
  {
   var pheight=750;
  }

 PTDMain.height=pheight;
 
  }