iTitleMaxLength  = 25;
iTeaserMaxLength = 150;

function letter_counter(sId, sType, sMaxLengthElement) {
    sPosOfUnderscore = sId.indexOf('_') + 1;
	sId = sId.substr(0,sPosOfUnderscore);
	if(sType == 'text') {
	    iLettersLeft = sMaxLengthElement - window.document.getElementById(sId + 'field').value.length;
	} else {
	    iLettersLeft = sMaxLengthElement - window.document.getElementById(sId + 'field').innerHTML.length;
	}
    window.document.getElementById(sId + 'counter').innerHTML = (iLettersLeft >= 0) ? iLettersLeft + ' Zeichen übrig' : Math.abs(iLettersLeft) + ' Zeichen über Idealwert';
}