function clear_input (tagId) {
 document.getElementById(tagId).innerHTML = document.getElementById(tagId).innerHTML; 
}

function display_hide(d) {

document.getElementById(d).style.display = "none";

}

function display_show(d) {

document.getElementById(d).style.display = "inline";

}

function display_by_box(boxName,divName) {
	if(boxName.checked) {
		display_show(divName);
	} else {
		display_hide(divName);
	} 
} 
checked=false;
function checkedAll () {
	if (checked == false){checked = true}else{checked = false}
	for (var i = 0; i < document.getElementById('check').elements.length; i++) {
		document.getElementById('check').elements[i].checked = checked;
	}
}

function remove_input(x,y) {
	if (x.value == y) {
		x.value = '';
	}
}

function change_input(x,y) {
		document.getElementById(x).value = y;
}

function smilie(smilietext) {
  var input = document.post.post_text;
  input.focus();
  /* for Inter Explorer */
  if(typeof document.selection != 'undefined') {
    /* insert smilie */
    var range = document.selection.createRange();
    var insText = range.text;
    range.text = smilietext;
    /* arange cursor position */
    range = document.selection.createRange();
    if (insText.length == 0) {
      range.move('character', -smilietext.length);
    } else {
      range.moveStart('character', smilietext.length + insText.length);      
    }
    range.select();
  }
  /* for new gecko based browsers */
  else if(typeof input.selectionStart != 'undefined')
  {
    /* insert smilie */
    var start = input.selectionStart;
    var end = input.selectionEnd;
    var insText = input.value.substring(start, end);
    input.value = input.value.substr(0, start) + smilietext + insText + input.value.substr(end);
    /* arange cursor position */
    var pos;
    if (insText.length == 0) {
      pos = start + smilietext.length;
    } else {
      pos = start + smilietext.length + insText.length;
    }
    input.selectionStart = pos;
    input.selectionEnd = pos;
  }
  /* for other browsers */
  else
  {
    /* ask for insert position */
    var pos;
    var re = new RegExp('^[0-9]{0,3}$');
    while(!re.test(pos)) {
      pos = prompt("Einfügen an Position (0.." + input.value.length + "):", "0");
    }
    if(pos > input.value.length) {
      pos = input.value.length;
    }
    /* insert smilie */
    input.value = input.value.substr(0, pos) + smilietext + insText + input.value.substr(pos);
  }
}