I'm not sure how to describe the effect I'm trying to achieve, so I'll point out a website that has implemented what I'd like to do:

http://isohunt.com/torrents.php?ihq=nature&ext=&op=and

Notice that a 'drop down' menu appears when a title is clicked on.
How is this done? Can PHP accomplish this neat feature?
On my website I have a blog and I want readers to have the option of leaving a comment about a blog entry.
But I don't want all the comments displayed at once. At first, I only want to display the number of comments that exist for a specific blog entry. Then make that number a hyperlink that drops down the comments for that specific blog entry. Make sense?

So basically:

------------------------
| Blog entry here............|
| blah blah blah blah blah |
| blah blah blah blah blah |
| blah blah blah blah blah |
| blah blah blah blah blah |
| blah blah blah blah blah |
------------------------

There are 5 comments available. (clicking the #5 would display the comments)

--------------------------
|comment 1: blah blah blah |
--------------------------

--------------------------
|comment 2: blah blah blah |
--------------------------

--------------------------
|comment 3: blah blah blah |
--------------------------

--------------------------
|comment 4: blah blah blah |
--------------------------

--------------------------
|comment 5: blah blah blah |
--------------------------

Close Comments (this feature would make the comments disappear again)

Any help would be greatly appreciated! Thank you for your time,

*Nick*

I think this belongs in the javascript forum, but just look at his source you can figure it out. you see the js file

/*
http://isohunt.com Interface Javascript
by Gary Fung - email: gary{REPLACE_WITH_THE_AT_SIGN}isohunt.com

Feel free to use / mod this to your heart's content,
but you must keep these lines to acknowledge where this code originated.
Comments, mods or additions you'd like add to this script? Post it here:
http://isohunt.com/forum/viewforum.php?f=1

Tip popup functions adapted from AWStats: http://awstats.sourceforge.net/
*/
var smooth_timer;
function go2(selID, link) {
  var selOBJ = (document.getElementById) ? document.getElementById(selID) : eval("document.all['" + selID + "']");
  window.location=link + selOBJ.options[selOBJ.selectedIndex].value;
}
function toclip(string) { window.clipboardData.setData('Text', string); }
function ShowTip(fArg) {
  var tooltipOBJ = (document.getElementById) ? document.getElementById('ih' + fArg) : eval("document.all['ih" + fArg + "']");
  if (tooltipOBJ != null) {
    var tooltipLft = (document.body.offsetWidth?document.body.offsetWidth:document.body.style.pixelWidth) - (tooltipOBJ.offsetWidth?tooltipOBJ.offsetWidth:(tooltipOBJ.style.pixelWidth?tooltipOBJ.style.pixelWidth:$TOOLTIPWIDTH)) - 30;
    var tooltipTop = 10;
    if (navigator.appName == 'Netscape') {
      if (parseFloat(navigator.appVersion) >= 5) { tooltipTop = (document.body.scrollTop>=0?document.body.scrollTop+10:event.clientY+10); }
      tooltipOBJ.style.left = tooltipLft; tooltipOBJ.style.top = tooltipTop;
    }
    else {
      tooltipTop = (document.body.scrollTop>=0?document.body.scrollTop+10:event.clientY+10);
      if ((event.clientX > tooltipLft) && (event.clientY < (tooltipOBJ.scrollHeight?tooltipOBJ.scrollHeight:tooltipOBJ.style.pixelHeight) + 10)) tooltipTop = (document.body.scrollTop?document.body.scrollTop:document.body.offsetTop) + event.clientY + 20;
      tooltipOBJ.style.pixelLeft = tooltipLft; tooltipOBJ.style.pixelTop = tooltipTop;
    }
    tooltipOBJ.style.visibility = "visible";
  }
}
function HideTip(fArg) {
  var tooltipOBJ = (document.getElementById) ? document.getElementById('ih' + fArg) : eval("document.all['ih" + fArg + "']");
  if (tooltipOBJ != null) tooltipOBJ.style.visibility = "hidden";
}
function smoothHeight(id, curH, targetH, stepH, mode) {
  diff = targetH - curH;
  if (diff != 0) {
    newH = (diff > 0) ? curH + stepH : curH - stepH;
    ((document.getElementById) ? document.getElementById(id) : eval("document.all['" + id + "']")).style.height = newH + "px";
    if (smooth_timer) window.clearTimeout(smooth_timer);
    smooth_timer = window.setTimeout( "smoothHeight('" + id + "'," + newH + "," + targetH + "," + stepH + ",'" + mode + "')", 20 );
  }
  else if (mode != "o") ((document.getElementById) ? document.getElementById(mode) : eval("document.all['" + mode + "']")).style.display="none";
}
function rowOver(i, nColor) {
  if (!nColor) nColor = "#ECECD9";
  var nameObj = (document.getElementById) ? document.getElementById('name' + i) : eval("document.all['name" + i + "']");
  if (nameObj != null) nameObj.style.background=nColor;
}
function rowOut(i, nColor) {
  var trObj = (document.getElementById) ? document.getElementById('ihtr' + i) : eval("document.all['ihtr" + i + "']");
  var nameObj = (document.getElementById) ? document.getElementById('name' + i) : eval("document.all['name" + i + "']");
  if (trObj == null || trObj.style.display=="none") nameObj.style.background=nColor;
}
function servOC(i, href, nColor) {
  var trObj = (document.getElementById) ? document.getElementById('ihtr' + i) : eval("document.all['ihtr" + i + "']");
  var nameObj = (document.getElementById) ? document.getElementById('name' + i) : eval("document.all['name" + i + "']");
  var ifObj = (document.getElementById) ? document.getElementById('ihif' + i) : eval("document.all['ihif" + i + "']");
  if (trObj != null) {
    if (trObj.style.display=="none") {
      trObj.style.display="";
      nameObj.style.background="#ECECD9";
      if (!ifObj.src) ifObj.src = href;
      smoothHeight('ihif' + i, 0, 210, 42, 'o');
    }
    else {
      nameObj.style.background=nColor;
      smoothHeight('ihif' + i, 210, 0, 42, 'ihtr' + i);
    }
  }
}
function trOC(idHL, idOC, idArrow) {
  var trObj = (document.getElementById) ? document.getElementById(idOC) : eval("document.all['" + idOC + "']");
  var hlObj = (document.getElementById) ? document.getElementById(idHL) : eval("document.all['" + idHL + "']");
  var arrowObj = (document.getElementById) ? document.getElementById(idArrow) : eval("document.all['" + idArrow + "']");
  if (trObj != null && hlObj != null) {
    if (trObj.style.display=="none") {
      trObj.style.display="";
      hlObj.style.background="#003366";
      hlObj.style.color="#EDF6F9";
      arrowObj.innerHTML="v";
    }
    else {
      trObj.style.display="none";
      hlObj.style.background="#ECECD9";
      hlObj.style.color="#000000";
      arrowObj.innerHTML="^";
    }
  }
}
function firstFocus()
{
   if (document.forms.length > 0)
   {
      var TForm = document.forms[0];
      for (i=0;i<TForm.length;i++)
      {
         if ((TForm.elements[i].type=="text")||
           (TForm.elements[i].type=="textarea")||
           (TForm.elements[i].type.toString().charAt(0)=="s"))
         {
            document.forms[0].elements[i].focus();
            break;
         }
      }
   }
}
function HighlightAll(theField) {
  var tempval=eval("document."+theField);
  tempval.focus();
  tempval.select();
  if (document.all) {
    therange=tempval.createTextRange();
    therange.execCommand("Copy");
    window.status="Contents highlighted and copied to clipboard!";
    setTimeout("window.status=''",5000);
  }
}
function NewWindow(mypage, myname, w, h, scroll) {
  var winl = (screen.width - w) / 2;
  var wint = (screen.height - h) / 2;
  winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
  win = window.open(mypage, myname, winprops)
  if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}
startList = function() {
  if (document.all&&document.getElementById) {
    navRoot = document.getElementById("nav");
    for (i=0; i<navRoot.childNodes.length; i++) {
      node = navRoot.childNodes[i];
      if (node.nodeName=="LI") {
        node.onmouseover=function() {
          this.className+=" navOver";
        }
        node.onmouseout=function() {
          this.className=this.className.replace(" navOver", "");
        }
      }
    }
  }
}
window.onload=startList;

Then look at how he makes a row and just copy it. The only php you really need to use other then the norm is $i++ to increase the numbers of the rows.

<tr class="hlRow" onClick="servOC(3,'/btDetails.php?ihq=nature&id=10592840','#cad9ea')" onMouseOver="rowOver(3)" onMouseOut="rowOut(3,'#cad9ea')"><td class=row3>Apps</td><td class="row3">331.8d</td><td class="row3" id=name3>Windows<br>6 <span class=hl>Nature</span> Screensavers.exe</td><td class="row3">14.15 MB</td><td class="row3">1</td><td class="row3"></td><td class="row3"></td><td class="row1">1</td></tr><tr style="display:none" id="ihtr3"><td bgcolor="#ECECD9" colspan="9"><table width="100%" cellspacing="0" cellpadding="0" border="0"><tr><td width="10"></td><td style="border:3px solid #003366"><iframe frameborder="0" width="100%" id="ihif3"></iframe></td></tr></table></td></tr>