<script type='text/javascript'>
  function Switchable(classname) {
  function getElementsByClassName(imgclass) {
if ( document.getElementsByClassName ) {
return document.getElementsByClassName(imgclass);
} else {
var nodes = document.getElementsByTagName('*'),
tmp = [];
for ( var i = 0; i < nodes.length; i++ ) {
if ( new RegExp('\\b' + imgclass + '\\b').test(nodes[i].className) ) {
tmp.push(nodes[i]);
}
}
return tmp;
}
  }

  function Next(element) {
var next = element;
while (next = next.nextSibling)
if ("innerHTML" in next)
return next;
return element;
  }

  function getCookie(a){var b=document.cookie.match(new RegExp("(?:^|; )"+a.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g,"\\$1")+"=([^;]*)"));return b?decodeURIComponent(b[1]):undefined}function setCookie(b,f,c){c=c||{};var i=c.expires;if(typeof i=="number"&&i){var h=new Date();h.setTime(h.getTime()+i*1000);i=c.expires=h}if(i&&i.toUTCString){c.expires=i.toUTCString()}f=encodeURIComponent(f);var a=b+"="+f;for(var e in c){a+="; "+e;var g=c[e];if(g!==true){a+="="+g}}document.cookie=a}
var nodes = getElementsByClassName(classname);
for (var i = 0; i < nodes.length; i++) {
var toggler = document.createElement("A");
toggler.href = "javascript://";
toggler.id = "toggler" + i;
toggler.innerHTML = getCookie("toggler" + i) == "hide" ? "+" : "-";
toggler.onclick = function () {
Next(this.parentNode).style.display = getCookie(this.id) == "hide" ? "" : "none";
setCookie(this.id, getCookie(this.id) == "hide" ? "show" : "hide", {
expires: new Date("01 Jan 2020")
});
this.innerHTML = getCookie(this.id) == "hide" ? "+" : "-";
};
Next(nodes[i]).style.display = getCookie("toggler" + i) == "hide" ? "none" : "";
nodes[i].appendChild(toggler);
}
  }

  Switchable("h_block");
  </script>

<div class='h_block'>
  Заголовок
  </div>
  <div>
  Содержимое
  </div>