<a onclick ="javascript:ShowHide('HiddenDiv_1')" href="javascript:;" >اظهار/اخفاء</a><div id="HiddenDiv_1" style="DISPLAY: none" >

المحتوى هنا

</div>
<script language="JavaScript">function ShowHide(divId){if(document.getElementById(divId).style.display == 'none'){document.getElementById(divId).style.display='block';}else{document.getElementById(divId).style.display = 'none';}}</script>

<a onclick ="javascript:ShowHide('HiddenDiv_1')" href="javascript:;" >اخفاء/اظهار</a><div id="HiddenDiv_1">

المحتوى هنا

</div>
<script language="JavaScript">function ShowHide(divId){if(document.getElementById(divId).style.display == 'none'){document.getElementById(divId).style.display='block';}else{document.getElementById(divId).style.display = 'none';}}</script>