<style type="text/css">    
.spoiler {    
background-color :#ffffff;    

background-repeat: repeat-x;    
}    
.spoilerheader {    
padding-left : 15px;    
background-image : url(http://school136.org.ua/img/favicons/plus.png);    
background-repeat: no-repeat;    
background-position:0 1;    
display:block;    
}    
.spoiler.open .spoilerheader {background-image : url(http://school136.org.ua/img/favicons/minus.png);}    
.spoiler .spoilertext {display:none;}    
.spoiler.open .spoilertext {display:block;}    
</style><script language="javascript">    
function spoiler_on()    
{    
//document.getElementById('spoiler').style.visibility='visible';    
document.getElementById('spoiler').style.display='';    
}    
function spoiler_off()    
{    
//document.getElementById('spoiler').style.visibility='hidden';    
document.getElementById('spoiler').style.display='none';    
}    
</script>