function markAttachmentAsDeleted(listItemId, confirmMessage) {
	var listItem = document.getElementById(listItemId);
	var fileNameDiv = listItem.getElementsByTagName("span")[0];
	var deleteButton = listItem.getElementsByTagName("input")[0];
	
	if (confirm(confirmMessage)) {
		document.getElementById("tx_seminars_pi1_seminars_delete_attached_files").value
			+= "," + fileNameDiv.firstChild.nodeValue;
		fileNameDiv.setAttribute("class", "deleted");
		deleteButton.disabled = true;
	}
}