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<style>
#button-spoiler {background-image:url('http://forumupload.ru/uploads/0000/12/13/488-1.gif'); padding:0; line-height:0; background-position:center; background-repeat:no-repeat; height:26px; width:100%}
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<script type="text/javascript">
function tag_spoiler(){
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}
function addSpoiler(str,from,internal){
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max_length=19;




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close = string.substring(0,pos_l);
open = string.substring(pos_l+1,string.length);
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close = string;
open = string;
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close = 'Показать спойлер';
open = 'Скрыть спойлер';
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	if((pos2=str.indexOf("[/spoiler]",pos+9))==-1) return str;
	str=str.substring(0,pos)+makeSpoiler(str.substring(pos_c+1,pos2),open,close)+str.substring(pos2+10,str.length)
	if( str.indexOf("[spoiler")!=-1 && internal==false) str=addSpoiler(str,0,false)
	return str;
}

function makeSpoiler(txt,open,close){
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	return txt;
}

$(document).ready(function(){
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$(this).parents("div.quote-box:first").find("blockquote.quote-box:first").toggle("slow");
var a = $(this).attr('value');$(this).attr('value',$(this).attr('id'));$(this).attr('id',a);
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});

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var post=elm[x]
post.innerHTML=addSpoiler(post.innerHTML,0,false)
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if(form=document.getElementById("form-buttons"))
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</script>