var info=[], clicked=-1;

function init(){
 var i=0;
 while (document.getElementById('sk'+i)!=null){
  info[i]=document.getElementById('sk'+i);
  i++;
 }
}

function show(num){
 clicked=num;
 var pos=findPos(document.getElementById('skbut'+num));
 info[num].style.visibility='visible';
 info[num].style.left=pos[0]+'px';
 info[num].style.top=pos[1]+30+'px';
}

function hide(){
 for (var i=0; i<info.length; i++){
  i==clicked ? info[i].style.visibility='visible' : info[i].style.visibility='hidden';
 }
}