function RX2BX( longitude,object_map ){ 
   // Real X to Browser X 

   drag_mx1 = getM(longitude,  mapXMin(), mapXMax()); 

   drag_mx2 = getM(longitude,  mapXMax(), mapXMin()); 
   var n1 = drag_mx1 * imageXMin(); 
   var n2 = drag_mx2 * imageXMax(); 

   var rc = (n1+n2)/(drag_mx1+drag_mx2); 

   rc = IX2BX(rc,object_map ); 

   return rc; 
 }


function  RY2BY( latitude,object_map ){  
    //hi Real Y to browser Y  

    drag_my1 =  getM(latitude,  mapYMax(), mapYMin());  

    drag_my3 =  getM(latitude,  mapYMin(), mapYMax());  

    var n1 = drag_my1 *  imageYMax();  
    var n2 = drag_my3 *  imageYMin();  

   var rc = (n1+n2)/(drag_my1+drag_my3); 

    rc = object_map.height-rc;

    rc =  IY2BY(rc,object_map);  

    return rc;  
  }