function getOccupation(){

	send = "";
	ajaxRequest(send,receiveNoRefresh);
}	


function ajaxRequest(send, receiveFunction) {
  if ( window.XMLHttpRequest ) { // Mozilla, Opera, Safari,...
    http_request = new XMLHttpRequest();
  }
  else if (window.ActiveXObject) { // IE
    http_request = new ActiveXObject("Microsoft.XMLHTTP");
  }

	http_request.onreadystatechange = receiveFunction;
	
	http_request.open("POST", "ajax/occupation.php", true);
	http_request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	http_request.send(send);
}


function receiveNoRefresh() {
	if ( http_request.readyState == 4 ) {
      if (http_request.status != 200) {
	    alert("Error while submitting changes: " + http_request.status);
	  }else if(http_request.responseText != ""){
		occ_arrays = http_request.responseText.split("|");
		occ_array_carol = convertDateArr(eval(occ_arrays[0]));
		occ_array_kirchh = convertDateArr(eval(occ_arrays[1]));
		occ_array_oberst1 = convertDateArr(eval(occ_arrays[2]));
		occ_array_oberst2 = convertDateArr(eval(occ_arrays[3]));
		calendarInit();
	  }
	}
}	

function convertDateArr(arr){
	for(var i=0; i<arr.length; i++){
		arr[i][0] *= 1000;
		arr[i][1] *= 1000;
	}
}