// --------------------------------
//  number
// --------------------------------
function formatNumber(a_num,a_bit)
{
	var num = String(a_num);
	if(num.length > a_bit)
	{
		return num.substr(0, a_bit);
	}
	
	while (num.length < a_bit)
	{
		num = "0" + num;
	}
	return num;
}
// --------------------------------
//  cookies
// --------------------------------
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}

// --------------------------------
//  detect MSIE version
// --------------------------------
function getIEVersion()
// Returns the version of Internet Explorer or a -1 (indicating the use of another browser).
{
  var rv = -1; // Return value assumes failure.
  if (navigator.appName == 'Microsoft Internet Explorer')
  {
    var ua = navigator.userAgent;
    var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
    if (re.exec(ua) != null)
      rv = parseFloat( RegExp.$1 );
  }
  return rv;
}

// --------------------------------
//  IE7,6加上仿:focus
// --------------------------------
sfFocus = function() {
	var inputs = document.getElementsByTagName("INPUT");
	var textareas = document.getElementsByTagName("TEXTAREA");
	//var sfEls = inputs.concat(textareas);
	setFocus(inputs);
	setFocus(textareas);
	function setFocus(e) {
		for (var i=0; i<e.length; i++) {
			e[i].onfocus=function() {
				this.className+=" sffocus";
			}
			e[i].onblur=function() {
				this.className=this.className.replace(new RegExp(" sffocus\\b"), "");
			}
		}
	}
}
if ((getIEVersion()<=7) && window.attachEvent) // IE7,6 apply
	window.attachEvent("onload", sfFocus);