var maxChars = 250;

$(document).ready(function() {
	
	$('#anzeigentext').bind('keyup',countChars);
    $('#anzeigentext').bind('focus',countChars);

}
)

function countChars()     {
      var chars = $('#anzeigentext').val();
      $('#size').text(chars.length);
      if(chars.length >= maxChars)	{
    	  $('#anzeigentext').val(chars.substring(0,maxChars));
      }
    
}