<style type='text/css'>
.headline {border: 0px solid #000000; cursor: pointer; width: 150px; text-align: left;}
.hidden {display: none; border: 0px solid #000000; text-align: center; margin-top: 0px;}
</style>
<script type="text/javascript">
  function show(ele) {
      var srcElement = document.getElementById(ele);
      if(srcElement != null) {
          if(srcElement.style.display == "block") {
            srcElement.style.display= 'none';
          }
          else {
            srcElement.style.display='block';
          }
      }
  }
</script>
<!--  -->
<div class="headline" onclick="show('cat1')"><p style="text-align: left;"><img class="alignleft" src="http://..." alt="Узнать больше" width="15" height="15"/>Узнать больше</p></div>
<!--  -->
<div class="hidden" id="cat1">
<!--ТЕКСТ БЛОКА-->
</div>

function getCookie(name) {
var matches = document.cookie.match(new RegExp(
"(?:^|; )" + name.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g, '\\$1') + "=([^;]*)"
));
return matches ? decodeURIComponent(matches[1]) : undefined;
}
!getCookie('rem') && window.setTimeout(function() {
var date = new Date(new Date().getTime() + 7 * 24 * 60 * 60 * 1000);
document.cookie = "rem=yes; path=/; expires=" + date.toUTCString();
d.classList.toggle("show_form");
window.setTimeout(function() {
d.classList.contains("show_form") && d.classList.toggle("show_form")
},5000) //open
},5000) //pause
});