function checkInput()
{
 
      var is_destination = 'reiseziel';
      var is_date = 'reisedatum';
      var is_name = 'name';	  
      var is_street = 'strasse';      
      var is_plz = 'plz';
      var is_place = 'ort';     
      var is_number = 'anzahl';      
	  var returnvalue = true;
  
	 
  var field_destination		 = document.getElementById('is_destination');
  var field_date        	 = document.getElementById('is_date');
  var field_name      		 = document.getElementById('is_name');  
  var field_street           = document.getElementById('is_street');
  var field_plz           	 = document.getElementById('is_plz');
  var field_place    		 = document.getElementById('is_place');
  var field_number           = document.getElementById('is_number');
  
  
  
  if (field_destination.value == "")
  {
	field_destination.style.backgroundColor = "#ffa3a3";
    field_destination.focus();
    returnvalue = false;
  }
  
  else
  {
	field_destination.style.backgroundColor = "#FFFFFF";
  }
    
  
  if (field_date.value == "")
  {
	  field_date.style.backgroundColor = "#ffa3a3";
      field_date.focus();
      returnvalue = false;
  }
  
  else
  {
	field_date.style.backgroundColor = "#FFFFFF";
  }
  
  if (field_name.value == "")
  {
	  field_name.style.backgroundColor = "#ffa3a3";
      field_name.focus();
      returnvalue = false;
  }
  
  else
  {
	field_name.style.backgroundColor = "#FFFFFF";
  }
  
   
  if (field_street.value == "")
  {
	  field_street.style.backgroundColor = "#ffa3a3";
      field_street.focus();
      returnvalue = false;
  }
 
 else
  {
	field_street.style.backgroundColor = "#FFFFFF";
  }
  
  if (field_plz.value == "")
  {
	  field_plz.style.backgroundColor = "#ffa3a3";
      field_plz.focus();
      returnvalue = false;
  }
  
  else
  {
	field_plz.style.backgroundColor = "#FFFFFF";
  }
  
  if (field_place.value == "")
  {
	  field_place.style.backgroundColor = "#ffa3a3";
      field_place.focus();
      returnvalue = false;
  }
  
  else
  {
	field_place.style.backgroundColor = "#FFFFFF";
  }
  
    
   if (field_number.value == "")
  {
	  field_number.style.backgroundColor = "#ffa3a3";
      field_number.focus();
      returnvalue = false;
  }
  
  else
  {
	field_number.style.backgroundColor = "#FFFFFF";
  }
  
  
  
  return(returnvalue);  
}