function getbyid(id) {
  itm = null;
  if (document.getElementById) {
    itm = document.getElementById(id);
  }
  else if (document.all) {
    itm = document.all[id];
  }
  else if (document.layers)   {
    itm = document.layers[id];
  }
  return itm;
}
function hide_div(itm) {
  if ( ! itm ) return;
  itm.style.display = "none";
}
function show_div(itm) {
  if ( ! itm ) return;
  itm.style.display = "";
}
function resizeTextarea(itm,direction) 
{
  var txtarea = document.getElementById(itm);
  if (direction == 'down') 
  {
   txtarea.rows = txtarea.rows + 3;
  } 
  else 
  {
   txtarea.rows = txtarea.rows - 3;
  }
}

function openCentered(theURL,winName,winWidth,winHeight,features) {
 var w = (screen.width - winWidth)/2;
 var h = (screen.height - winHeight)/2 - 30;
 features = features+',width='+winWidth+',height='+winHeight+',top='+h+',left='+w;
 window.open(theURL,winName,features);
}

function getElementsByClass(searchClass, node, tagName) {
  if(node == null) {
    node = document;
  }
  // For browsers that have this built in
  if(document.getElementsByClassName) {
      return node.getElementsByClassName(searchClass);
  }
  // at least try with querySelector (IE8 standards mode)
  // about 5x quicker than below
  if(node.querySelectorAll) {
    if (tagName == null) {
  	  tagName = '';
    }
    return node.querySelectorAll(tagName + '.' + searchClass);
  }
  // For everything else
	var classElements = new Array();
	if (tagName == null) {
		tagName = '*';
  }
	var els = node.getElementsByTagName(tagName);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\\\s)' + searchClass + '(\\\\s|$)');
	for (i = 0, j = 0; i < elsLen; i++) {
		if(pattern.test(els[i].className)) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}