The js code that is better for multi-browser compatibility

<script type="text/javascript">
function copy_code(copyText)
{
if ()
{
("Text", copyText)
}
else
{
var flashcopier = 'flashcopier';
if(!(flashcopier))
{
var divholder = ('div');
= flashcopier;
(divholder);
}
(flashcopier).innerHTML = '';
var divinfo = '<embed src="../js/_clipboard.swf" FlashVars="clipboard='+encodeURIComponent(copyText)+'" width="0" height="0" type="application/x-shockwave-flash"></embed>';
(flashcopier).innerHTML = divinfo;
}
alert('copy succeeds!');
}
</script>
<input type="button" value="test" onclick="copy_code('Copy successful!')" />