hide/show nested divs

try:

<script type="text/javascript"><!--
function toggle(i)
{
	var div = document.getElementById(i);
	if( div.style.display=='none')
		div.style.display=''
	else
		div.style.display='none'
}
//--></script>
<span onclick="toggle('main')">Toggle Main</span>
<div id='main' style='display:none'>
    <div>...a</div>
    <div>...b</div>
    <div>...c</div>
</div>

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you must set "display" attribute. for example use a function like this:

<script type="text/javascript" language="javascript">
function SwitchVisibility(eID)
{
if (document.getElementById(eID).style.display=="none")
    document.getElementById(eID).style.display="";
else
    document.getElementById(eID).style.display="none";
}
</script>

and for change the display mode for any element you must call the function with id's of your element.
for example :
<div id="MainDiv">
      <div id="Div1" style="display:none">
            11111111111111111111111111111111111111111111111111111111</br>
      </div>
      <div id="Div2" style="display:none">
            22222222222222222222222222222222222222222222222222222222</br>
      </div>
      <div id="Div3" style="display:none">
            33333333333333333333333333333333333333333333333333333333</br>
      </div>
</div>
<span onclick="SwitchVisibility('Div2');">click here</span>

thx hielo,
this will hide the main div too, is it possible to show/hide only the nested divs?

<div id='main' style='display:none'>
    <span onclick="ShowHideNested('main')">Toggle Main</span>
    <div>...a</div>
    <div>...b</div>
    <div>...c</div>
</div>

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thank you for your help

You are welcome!