Problem with mouse controlling

Hi,
i want control my player with mouse. So i followed some tutorial and i write this code:

function SceneWindow2D::mouseMoveShip(%this, %mod, %worldPosition)
{
   %movement = t2dvectorsub(%worldPosition, $lastMousePos);  
   
   //Set the starting position here      
   %playerPosition = $Player.getPosition();  
   %mousePosition = sceneWindow2D.getMousePosition();      
   //%xMouse = getWord(%mousePosition, 0);  
   //%yMouse = getWord(%mousePosition, 1);
   %Angle = t2dAngletoPoint(%playerPosition, %mousePosition);        


// this       
// $player.setLinearVelocityPolar(%Angle, 10);

// or this (i had the same result)
// $player.moveTo(%mousePosition,5,false,false, true,0.0);

   $lastMousePos = $player.getPosition();
}
function SceneWindow2D::onMouseDown(%this, %mod, %worldPosition, %mouseClicks)
{
   %this.mouseMoveShip(%mod, %worldPosition);
}

In this way, every time i click, the player moves toward the mouse pointer of a little step. It's nice but i want a little different behaviour. I want that the player moves continuously towards the mouse pointer when the mouse button it's down and stops only if i release the button (no drag, it's different!).
Thank you!
Sorry for my bad English isn't my native speaking language...