var hide=true;
function hidePic()
{ 
myalt.style.visibility="hidden"; 
myalt.innerHTML=""; 
myalt.style.top=0; 
myalt.style.left=0; 
hide=true; 
} 
function movePic(word)
{ 
_x=window.event.clientX; 
_y=window.event.clientY; 
_dx=30
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+10; 
myalt.style.top=_y+document.body.scrollTop; 
if(hide){ 
myalt.innerHTML=word; 
myalt.style.visibility="visible"; 
hide=false; 
} 
}