function singeltag(text) {
        var d = document.getElementById('tekst');
        d.innerHTML += text;
}

	function smile(veld, smile)
{
	if (document.selection)
  	{
		veld.focus();
		var selection = document.selection.createRange();
		selection.text = smile;
  	}
  	else if (veld.selectionStart || veld.selectionStart == '0')
  	{
		var startPos = veld.selectionStart;
		var endPos = veld.selectionEnd;

		veld.value = veld.value.substring(0, startPos)
		+ smile + veld.value.substring(endPos, veld.value.length);
  	}
  	else
  	{
		veld.value += smile;
  	}
}

function tag(veld, tag1, tag2)
{
	if (!tag2)
	{
		tag2 = tag1;
	}

	if (document.selection)
	{
		veld.focus();
		var selection = document.selection.createRange();

		if(selection.text)
		{	
			selection.text = "["+tag1+"]"+selection.text+"[/"+tag2+"]";
		}
		else
		{
			veld.value += "["+tag1+"] [/"+tag2+"]";
		}
	}
	else if (veld.selectionStart || veld.selectionStart == '0')
	{
		var startPos = veld.selectionStart;
		var endPos = veld.selectionEnd;

		if (startPos != endPos)
		{
			veld.value = veld.value.substring(0, startPos)
			+ "["+tag1+"]"
      			+ veld.value.substring(startPos, endPos)
			+ "[/"+tag2+"]"
			+ veld.value.substring(endPos, veld.value.length);
		}
		else
		{
			veld.value = veld.value.substring(0, startPos)
			+ "["+tag1+"] [/"+tag2+"]"
			+ veld.value.substring(endPos, veld.value.length);
		}
	}
}

function resetdatum(invoer) { 
 document.formulier.datum.value = invoer; 
 }