В хтмл-низ

 

Код:
  <script>
    function HideInfo(id,but){
    if(but.value=="+"){
      but.value = "-";document.getElementById(id).style.display = ""}
    else{
      but.value = "+";document.getElementById(id).style.display = "none"}
      return false}

    d = document.getElementsByTagName("div")

    for (i=0;d[i]; i++){
    if (d[i].className.indexOf("post-author")!=-1){t = d[i].innerHTML
       if((j = t.toLowerCase().indexOf("<li class=pa-from>"))!=-1 || (j = t.toLowerCase().indexOf("<li class=\"pa-from\">"))!=-1 || (j = t.toLowerCase().indexOf("<li class=pa-reg>"))!=-1 || (j = t.toLowerCase().indexOf("<li class=\"pa-reg\">"))!=-1)
        d[i].innerHTML = t.substring(0,j)+"<input type='Submit' onClick=\"return HideInfo('info"+i+"',this)\" value='+'><br><div id='info"+i+"' style='display:none'>"+t.substring(j,t.length)+"</div>"}}
    </script>