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<script type="text/javascript">
	function tag_it(tag_name)
	{
		document.testform.text.value = document.testform.wert.value + " " + tag_name;
		document.write(document.testform.wert.value);
	}
</script>


<form name="testform" action="">
 <input type="text" name="wert" value="">
</form>


<a href="javascript:tag_it('hallo');">hallo<a/>

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<script type="text/javascript">
	function tag_it(tag_name)
	{
		document.testform.wert.value = document.testform.wert.value + " " + tag_name;
	}
</script>


<form name="testform" action="">
 <input type="text" name="wert" value="">
</form>


<a href="javascript:tag_it('hallo');">hallo<a/>