function setTextfieldBackground(f_id, f_type, f_focus)
{
	if(f_focus == undefined)
	{
		f_focus = false;
	}

	if(oElement = document.getElementById(f_id))
	{
		if(f_focus || oElement.value.length)
		{
			oElement.style.backgroundImage = 'none';
		}
		else
		{
			oElement.style.backgroundImage = 'url(http://www.caatjespen.nl/images/textfield_' + f_type + '.gif)';
			oElement.style.backgroundRepeat = 'no-repeat';
			oElement.style.backgroundPosition = 'center left';
		}
	}
}