function isValidEmail(input){
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return filter.test(input);
}

function trimForm(form){
	for(var i = 0 ; i  < form.elements.length; i++){
		if(form.elements[i].type == 'text' || form.elements[i].type == 'textarea'){
			form.elements[i].value = trim(form.elements[i].value);
		}
	}
}

// Removes leading whitespaces
function LTrim( value ) {
	var re = /\s*((\S+\s*)*)/;
	return value.replace(re, "$1");
}

// Removes ending whitespaces
function RTrim( value ) {
	var re = /((\s*\S+)*)\s*/;
	return value.replace(re, "$1");
}

// Removes leading and ending whitespaces
function trim( value ) {
	return LTrim(RTrim(value));
}

function limitTextArea(input, length){
	input.value = input.value.substring(0, length);
}

function hideObject(obj){
	if(obj == null)
		return;
	if (window.ActiveXObject) { // IE
	  obj.style.display = "none";
	} else if (window.XMLHttpRequest) { // Mozilla, Safari,...
	  obj.style.display = "none";
	}
}

function showObject(obj){
	if(obj == null)
		return;
	if (window.ActiveXObject) { // IE
	  obj.style.display = "block";
	} else if (window.XMLHttpRequest) { // Mozilla, Safari,...
	  obj.style.display = "table-row";
	}
}

function getRadioButtonValue(obj){
	if(obj.length == null)
		return obj.value;
	for(var i = 0; i < obj.length; i++){
		if(obj[i].checked)
			return obj[i].value;
	}
}

function isInteger(sInteger){
	var re = /^(-)?\d+$/;
	return re.test(sInteger);
}

function isDatetime(sDatetime) { 
	var re = /^\d{4}\-\d{2}\-\d{2}\s([0-1][0-9]|[2][0-3]):([0-5][0-9]):([0-5][0-9])$/;
	if (re.test(sDatetime)) { 
		var dtArr = sDatetime.split(" ");
		var dArr = dtArr[0].split("-");  //date part
		var d = new Date(dArr[1] + '-' + dArr[2] + '-' + dArr[0]); 
		return d.getMonth() + 1 == dArr[1] && d.getDate() == dArr[2] && d.getFullYear() == dArr[0];
	} 
	else { 
		return false; 
	} 
} 

var selectedMenuId = "";

function showDetail(id){
	if(selectedMenuId != ""){
		hideDetail(selectedMenuId);
	}
	hideObject(document.getElementById("menu_" + id));	
	showObject(document.getElementById("menu_" + id + "_selected"));
	showObject(document.getElementById("menu_" + id + "_detail"));
	selectedMenuId = id;
}

function hideDetail(id){
	showObject(document.getElementById("menu_" + id));	
	hideObject(document.getElementById("menu_" + id + "_selected"));
	hideObject(document.getElementById("menu_" + id + "_detail"));
	selectedMenuId = "";
}

function GetXmlHttpObject()
{
	var xmlHttp=null;
	try
	  {
	  // Firefox, Opera 8.0+, Safari
	  xmlHttp=new XMLHttpRequest();
	  }
	catch (e)
	  {
	  // Internet Explorer
	  try
	    {
	    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
	    }
	  catch (e)
	    {
	    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	    }
	  }
	return xmlHttp;
}

function compareOptionText(a,b) {
  /*
   * return >0 if a>b
   *         0 if a=b
   *        <0 if a<b
   */
  // textual comparison
  return a.text.toUpperCase() != b.text.toUpperCase() ? a.text.toUpperCase() < b.text.toUpperCase() ? -1 : 1 : 0;
  // numerical comparison
//  return a.text - b.text;
}

function sortOptions(list) {
  var items = list.options.length;
  // create array and make copies of options in list
  var tmpArray = new Array(items);
  for ( i=0; i<items; i++ )
	tmpArray[i] = new Option(list.options[i].text,list.options[i].value);
  // sort options using given function
  tmpArray.sort(compareOptionText);
  // make copies of sorted options back to list
  for ( i=0; i<items; i++ )
	list.options[i] = new Option(tmpArray[i].text,tmpArray[i].value);
}

var tgs = new Array('div','td','tr', 'span', 'a', 'p');

//Specify spectrum of different font sizes:
var sizeOffset = 0;

var default_size = 11;

function increaseSize(){
	if(sizeOffset > 4)
		return;

	var page_content = document.getElementById("page_content");

	for ( i = 0 ; i < tgs.length ; i++ ) {
		var cTags = page_content.getElementsByTagName( tgs[ i ] );

		for ( j = 0 ; j < cTags.length ; j++ ) {

			var size = parseInt(cTags[ j ].fontSize);

			if(size.toString() == "NaN") {
				size = parseInt(YAHOO.util.Dom.getStyle(cTags[ j ], 'font-size')); 
			}

			if(size.toString() == "NaN") {
				size = default_size;
			}

			size += 2;
			cTags[ j ].style.fontSize = size + "px";
		}
	}

	sizeOffset += 2;
	YAHOO.util.Cookie.set("sizeOffset", sizeOffset);
}

function decreaseSize(){
	if(sizeOffset == 0)
		return;

	var page_content = document.getElementById("page_content");

	for ( i = 0 ; i < tgs.length ; i++ ) {
		var cTags = page_content.getElementsByTagName( tgs[ i ] );

		for ( j = 0 ; j < cTags.length ; j++ ) {

			var size = parseInt(cTags[ j ].fontSize);

			if(size.toString() == "NaN") {
				size = parseInt(YAHOO.util.Dom.getStyle(cTags[ j ], 'font-size')); 
			}

			if(size.toString() == "NaN") {
				size = default_size;
			}

			size -= 2;
			cTags[ j ].style.fontSize = size + "px";
		}
	}

	sizeOffset -= 2;
	YAHOO.util.Cookie.set("sizeOffset", sizeOffset);
}

function restoreFontSize(){
    var cookie_value = YAHOO.util.Cookie.get("sizeOffset");

	if(cookie_value == null)
		return;

	cookie_value = parseInt(cookie_value);

	var page_content = document.getElementById("page_content");

	for ( i = 0 ; i < tgs.length ; i++ ) {
		cTags = page_content.getElementsByTagName( tgs[ i ] );

		for ( j = 0 ; j < cTags.length ; j++ ) {

			var size = parseInt(cTags[ j ].fontSize);

			if(size.toString() == "NaN") {
				size = parseInt(YAHOO.util.Dom.getStyle(cTags[ j ], 'font-size')); 
			}

			if(size.toString() == "NaN") {
				size = default_size;
			}

			size += cookie_value;
			cTags[ j ].style.fontSize = size + "px";
		}
	}

	sizeOffset = cookie_value;
}

function getCssRules(name){
	var styleSheets = document.styleSheets;

	for(var i = 0; i < styleSheets.length; i++) {
		var rules = styleSheets[i].cssRules || styleSheets[i].rules;

		for (var j = 0; j < rules.length; j++) {
			if (rules[j].selectorText == name) {
				return rules[j];
			}
		}
	}
	return null;
}

function goSelect(daform) {
	with(daform) {
		location.href=options[selectedIndex].value;
	}
}

function siteSearch(){
	var frm = document.form1;
	frm.as_q.value = frm.search_input.value;
	frm.action = "http://www.google.com.hk/search";
	frm.method = "GET";
	frm.target = "_blank";
	frm.submit();
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}