show hide div (hide last open div)

[flash]

Hello I'm trying to do a show hide div function that will hide the last open div and will open the new one

<script type="text/Javascript"> 
function HideContent(d) {document.getElementById(d).style.display = "none";}
function ShowContent(d) {document.getElementById(d).style.display = "";}
function ReverseContentDisplay(d) 
{if(document.getElementById(d).style.display == "none") {
document.getElementById(d).style.display = ""; 
}else { document.getElementById(d).style.display = "none"; }}
</script>

I got this function that works for hiding and showing div but it doesnt hide the last div when a new one is open instead opens a new one
someone suggested me to use this

if (previousD != null) { HideContent(previousD); }
previousD = d;

but I'm not really sure how to use it , can someone help me please.
I'm using javascript:ReverseContentDisplay('number') to show/hide the div i'm not sure if/how i should use HideContent/ShowContent functions too.
help please.

[BYK]

<script type="text/Javascript"> 
var previousD;
function HideContent(d) {document.getElementById(d).style.display = "none";}
function ShowContent(d) {document.getElementById(d).style.display = "";}
function ReverseContentDisplay(d) 
{if(document.getElementById(d).style.display == "none") {
ShowContent(d);if (!previousD) HideContent(previousD);previousD = d;
}else HideContent(d)}
</script>

Above code should make the trick for you. But try to understand waht you are doing if you want to learn something. (But above code is not a good example to study on, since it is not well-formed.)

[flash]

Yes BYK I understand that its not the way to learn.
the new code still doesnt hide me the last opened div BYK.
I'm not sure what im doing wrong.

[Master_script_maker]

try this

<script type="text/Javascript"> 
var previousD;
function HideContent(d) {document.getElementById(d).style.display = "none";}
function ShowContent(d) {document.getElementById(d).style.display = "";}
function ReverseContentDisplay(d) 
{if(document.getElementById(d).style.display == "none") {
if(previousD != null) { HideContent(previousD); } ShowContent(d); previousD = d; 
}else {HideContent(d);}}
</script>

[BYK]

The above code definitely will hide the div itself immediately after its visible.
Ok just switch the

(!previousD)

to

(previousD != null)

[flash]

 <p><a href="javascript:ReverseContentDisplay('05')"><img src="disc1.jpg" width="100" BORDER="0" height="103" title="èëðåìåâéä àçøú"></a><a href="javascript:ReverseContentDisplay('04')"><img src="disk2.jpg" width="100" BORDER="0" height="84" title="the sound of silent"></a><a href="javascript:ReverseContentDisplay('03')"><img src="disk3.jpg" width="100"  BORDER="0" height="102" title="âåìí"></a><a href="javascript:ReverseContentDisplay('02')"><img src="disk4.jpg" width="100" BORDER="0"  height="96" title="äöã äàçø"></a><a href="javascript:ReverseContentDisplay('01')"><img src="disc5.jpg" width="100"  BORDER="0" height="102" title="ãéñ÷ì÷åìéä"></a></p>

this is the code i use to show and hide it and show it

and something like this
<div id="02" class="city-list" style="display: none;">
content here
</div>
maybe it should come with a css code too that i missing
I under the logicstic behind this but i cant seem to figure out how to make this work been trying to make this work for weeks