var hide = true;

function movePic(word){

   if (hide){
       myalt.innerHTML = word;
       myalt.style.visibility = "visible";
       hide = false;
   }
}

function _movePic(word){

   _x = window.event.clientX;
   _y = window.event.clientY;
   _dx = 5;
   left = false;
   right = false;

   if (_dx + _x + myalt.clientWidth > document.body.clientWidth){_x = document.body.clientWidth - myalt.clientWidth - _dx; left = true;} 

   if (_dx + _y + myalt.clientHeight > document.body.clientHeight){_y = document.body.clientHeight - myalt.clientHeight - _dx; right = true;} 

   if (left && right){_y = document.body.clientHeight - myalt.clientHeight - _dx * 4;}

   myalt.style.left = _x;
   myalt.style.top = _y + document.body.scrollTop;

   if (hide){
       myalt.innerHTML = word;
       myalt.style.visibility = "visible";
       hide = false;
   }

} 

function hidePic(){
   myalt.style.visibility = "hidden";
   myalt.innerHTML = "";
   myalt.style.top = 0;
   myalt.style.left = 0;
   hide = true;
}