url "vrmlscript:
              function initialize() {
                  setWindowRect(Browser.windowAspect);
                  pos = orgPos;
                  correctPosition();
              }
              function aspectRatio(value,time) {
                  setWindowRect(value);
                  correctPosition();
              }
              function setWindowRect(aspect) {
                  if(aspect>1) {
                  // if aspect>1, Y is constant, so X is relative to AspectRatio
                      node   = Browser.boundViewpoint;
                      //print (' 1: ratio == ' + aspect);
                      //yfovx   = node.fieldOfView;
                      //print (' 1: yfovx == ' + yfovx);
                      if (yfov==0) { yfov = 0.785398; }
                      //xfov = Math.atan(aspect*(Math.tan(yfov/2)))*2;
                      right  = (aspect*(Math.tan(yfov/2))) * 2.0 + 0.1;
                      top    =  0.95;
                  } else {
                  // if aspect<1, X is constant, so Y is relative to AspectRatio
                      //xfov   = Browser.boundViewpoint.fieldOfView;
                      if(xfov==0) { xfov = 0.785398; }
                      //yfov = Math.atan((Math.tan(yfov/2))/aspect)*2;
                      right  = 0.95;
                      top    = ((Math.tan(xfov/2))/aspect) * 2.0 + 0.1;
                  }
  
                  //print ('ratio == ' + aspect);
                  //print ('yfov == ' + yfov);
                  //print ('xfov == ' + xfov);
                  //print ('angleRatio == ' + angleRatio);
  
                  left   = -right;
                  bottom = -top;
              }
  
              function setRotateTrans (value,time) {
                  rotA =  new SFRotation(0,1,0, value.x*10);
                  rotB =  new SFRotation(1,0,0,-value.y*10);
                  rotation_changed = rotA.multiply(rotB);
              }
              function doDrag(value,time) {
                  if(!value) {
                      orgPos = pos;
                  } else {
                      pos = orgPos;
                      correctionRot = orgRot;
                  }
              }
              function correctPosition() {
  
                  // Snap position to edge of screen
                  dx = 0;
                  dy = 0;
                  if(pos.x > xCenter) { dx = right-pos.x; }
                  else                { dx = pos.x-left; }
                  if(pos.y < yCenter) { dy = pos.y-bottom; }
                  else                { dy = top-pos.y; }
  
                  if(dx<dy) {
                      if(pos.x > xCenter) {
                          armRotation        = new SFRotation(0,0,1,0);
                          correctionRotation = new SFRotation(0,0,1,0);
                          orgRot             = new SFRotation(0,0,1,0);
                          pos.x              = right;
                      } else {
                          armRotation        = new SFRotation(0,0,1, 3.14);
                          correctionRotation = new SFRotation(0,0,1,-3.14);
                          orgRot             = new SFRotation(0,0,1, 3.14);
                          pos.x              = left;
                      }
                  } else /* dy<dx */ {
                      if(pos.y < yCenter) {
                          armRotation        = new SFRotation(0,0,1,-1.57);
                          correctionRotation = new SFRotation(0,0,1, 1.57);
                          orgRot             = new SFRotation(0,0,1,-1.57);
                          pos.y              = bottom;
                      } else {
                          armRotation        = new SFRotation(0,0,1, 1.57);
                          correctionRotation = new SFRotation(0,0,1,-1.57);
                          orgRot             = new SFRotation(0,0,1, 1.57);
                          pos.y              = top;
                      }
                  }
  
                  // Limit position to screen 
                  if(pos.y < bottom) { pos.y = bottom; } 
                  if(pos.y > top)    { pos.y = top; } 
                  if(pos.x < left)   { pos.x = left; } 
                  if(pos.x > right)  { pos.x = right; } 
  
                  newPos = pos;
              }
              function setDragTrans (value,time) {
                  rotVal = correctionRot.multVec(value);
                  pos    = new SFVec3f();
                  pos.x  = orgPos.x + rotVal.x;
                  pos.y  = orgPos.y + rotVal.y;
                  pos.z  = orgPos.z;
                  correctPosition();
              }
          "
      }