<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>