[Issvar]

To make the expand all and contract all links not require reloading do the following:

In the showthread template find

function expand(listID) {

and add above that:

function contractAll() {
	var aDivs=document.body.getElementsByTagName("div");
	for (x=0;x<aDivs.length;x++) {
		if (/^p[0-9]{1,8}h$/.test(aDivs[x].id)) {
			aDivs[x].style.display="";
		} else if (/^p[0-9]{1,8}e$/.test(aDivs[x].id)) {
			aDivs[x].style.display="none";
		}
	}
	window.event.cancelBubble=true;
}
function expandAll() {
	var aDivs=document.getElementsByTagName("div");
	for (x=0;x<aDivs.length;x++) {
		if (/^p[0-9]{1,8}e$/.test(aDivs[x].id)) {
			aDivs[x].style.display="";
		} else if (/^p[0-9]{1,8}h$/.test(aDivs[x].id)) {
			aDivs[x].style.display="none";
		}
	}
	window.event.cancelBubble=true;
}

Then in the showthread_hideposts template find

<a href="showthread.php?threadid=$thread[threadid]&s=$session[sessionhash]&perpage=$perpage&pagenumber=$pagenumber&display=show">

and replace that with

<a href="#" onclick="expandAll();return false;">

Then find also in the showthread_hideposts template

<a href="showthread.php?threadid=$thread[threadid]&s=$session[sessionhash]&perpage=$perpage&pagenumber=$pagenumber&display=none">

and replace that with

<a href="#" onclick="contractAll();return false;">

And for Bira, feel free to use this in an update to the full hack if you find it worthwhile.