try this this code is for IE...
<script language="javascript">
function doCopy()
{
document.execCommand('Copy',false,0);
}
function doPaste()
{
document.execCommand('Paste');
}
function doCut()
{
document.execCommand('Cut',false,0);
}
function doSelectAll()
{
document.execCommand('SelectAll',false,0);
}
function doDelete()
{
document.execCommand('Delete',false,0);
}
function doUndo()
{
document.execCommand('Undo',false,0);
}
function doUnselect()
{
document.execCommand('Unselect',false,0);
}
</script>
</head>
<body>
<div align="center">
input values : ---- <br>
<textarea align="left" id="txtArea" name="txtArea" style="width:300px; height:50px"></textarea>
<br>
<input type="button" id="btnCopy" name="btnCopy" value=" Copy " önclick="doCopy()" />
<input type="button" id="btnCut" name="btnCut" value=" Cut " önclick="doCut()" />
<input type="button" id="btnSelectAll" name="btnSelectAll" value=" Select All " önclick="doSelectAll()" />
<input type="button" id="btnPaste" name="btnPaste" value=" Paste " önclick="doPaste()" />
<input type="button" id="btnDelete" name="btnDelete" value=" Delete " önclick="doDelete()" />
<input type="button" id="btnUndo" name="btnUndo" value=" Undo " önclick="doUndo()" />
<input type="button" id="btnUnselect" name="btnUnselect" value=" Undo " önclick="doUnselect()" />
<br>
Manipulate <br>
<textarea align="left" id="txtArea1" önpaste="alert('yes');" name="txtArea1" style="width:300px;height:70px" ></textarea>
</div>