function DIVShow_a(i){
    if( document.getElementById(i).style.display=='')
   {          

       document.getElementById(i).style.top = document.documentElement.scrollTop + event.clientY ;
       document.getElementById(i).style.left =  document.documentElement.scrollLeft + event.clientX ; 
       document.getElementById(i).style.display = 'none';
   } 
    else
   {       

       document.getElementById(i).style.top = document.documentElement.scrollTop + event.clientY ;
       document.getElementById(i).style.left =  document.documentElement.scrollLeft + event.clientX ; 
       document.getElementById(i).style.display = '';      
   } 
}