var dom = (document.getElementById) ? true : false; 
var ns5 = ((navigator.userAgent.indexOf("Gecko")>-1) && dom) ? true: false; 
var ie5 = ((navigator.userAgent.indexOf("MSIE")>-1) && dom) ? true : false; 
var ns4 = (document.layers && !dom) ? true : false; 
var ie4 = (document.all && !dom) ? true : false; 

function getObj(id) 
{ 
  if (dom) return document.getElementById(id);
  return (ns4) ? document.layers[id] : (ie4) ? document.all[id] : (ie5||ns5) ? document.getElementById(id) : null; 
}

// Array.indexOf( value, begin, strict ) - Return index of the first element that matches value
Array.prototype.indexOf = function( v, b, s ) {
 for( var i = +b || 0, l = this.length; i < l; i++ ) {
  if( this[i]===v || s && this[i]==v ) { return i; }
 }
 return -1;
};

// remove array element if present, returns boolean
Array.prototype.reMove = function (element) {
	var result = false;
	var array = [];
	for (var i = 0; i < this.length; i++) {
		if (this[i] == element) {
			result = true;
		} else {
			array.push(this[i]);
		}
	}
	this.clear();
	for (var i = 0; i < array.length; i++) {
		this.push(array[i]);
	}
	array = null;
	return result;
};

// Array.splice() - Remove or replace several elements and return any deleted elements
if( typeof Array.prototype.splice==='undefined' ) {
 Array.prototype.splice = function( a, c ) {
  var i = 0, e = arguments, d = this.copy(), f = a, l = this.length;
  if( !c ) { c = l - a; }
  for( i; i < e.length - 2; i++ ) { this[a + i] = e[i + 2]; }
  for( a; a < l - c; a++ ) { this[a + e.length - 2] = d[a - c]; }
  this.length -= c - e.length + 2;
  return d.slice( f, f + c );
 };
}

function showHTML(id, str) {
// display a string inside an HTML block element
  obj = getObj(id);
  obj.innerHTML = str;
  return;
}

function setState(id, dsply) {
  obj = getObj(id);
  if (dsply=='hide') obj.style.visibility = 'hidden';
  if (dsply=='show') obj.style.visibility = 'visible';
  return;
}

function setDisplay(id, dsply) {
  obj = getObj(id);
  if (dsply=='none') obj.style.display = 'none';
  if (dsply=='block') obj.style.display = 'block';
  return;
}