<html>
<head> </head>
<body>
<script>
ok=true;
document.num = 0;
document.num2 = 1;
function BLOK(){
document.block = document.getElementById('block');
if(ok == true){
document.num=0;
smena()
}
else{document.num2=1;smena2()}
}
function smena(){
document.num +=0.15;
if(document.num > 1) return;
document.block.setAttribute('style','opacity:'+document.num)
setTimeout('smena()',100)
}
function smena2(){
document.num2 -=0.15;
if(document.num2 < 0){document.block.setAttribute('style','opacity:'+document.num2);return;}
document.block.setAttribute('style','opacity:'+document.num2)
setTimeout('smena2()',100)
}
</script>
<a onclick='BLOK();if(ok==true){ok=false;}else{ok=true};return false' href='file:\\\lol'>Блок</a>
<div id='block' style='opacity:0'>Я скрытый блок</div>
</body>
</html>
