var ie4 = (document.all) ? true : false;
var ns4 = (document.layers) ? true : false;
var ns6 = (document.getElementById && !document.all) ? true : false;

/**
 * Do nothing :)
 */
function noop() {
  return false;
}

/**
 * Changes form's action url and submits the form
 * @param form - form to submit
 * @param url - a new url to submit the form to
 */
function redir(form, url) {
  form.action = url;
  form.submit();
}

function askDelete(what) {
  return confirm('Are you sure you want to delete this ' + what);
}

/**
 * Opens url replacing current url
 */
function urlOpen(url) {
  var frame = (arguments.length>1) ? arguments[1] : window;
  frame.location.href = url;
}

function submitForm(formName) {
  var theform = eval('document.' + formName);
  if(theform != 'undefined') theform.submit();
  return false;
}

/**
 * Gets rid of a comma in formatted double value
 */
function cleanDouble(value) {
  var re = /\,/g;
  return value.replace(re,'');
}

// ===================================================================
// Layer show/hide functions
// ===================================================================

/**
 * Hides a layer
 * @param layer - name of the layer to be hidden
 * @param imgHide - image to hide
 * @param imgShow - image to show
 */
function hide(layer, imgHide, imgShow) {
  if(ie4) {
    document.all[layer].style.visibility = "hidden";
    document.all[layer].style.display= "none";
    if(typeof(imgHide) != 'undefined' && imgHide != '') {
      document.all[imgHide].style.visibility = "hidden";
      document.all[imgHide].style.display = "none";
    }
    if(typeof(imgShow) != 'undefined' && imgShow != '') {
      document.all[imgShow].style.visibility = "visible";
      document.all[imgShow].style.display = "block";
    }
  }
  if(ns4) {
    document.layers[layer].visibility = "hide";
  }
  if(ns6) {
    document.getElementById([layer]).style.visibility = "hidden";
    document.getElementById([layer]).style.display = "none";
    if(typeof(imgHide) != 'undefined' && imgHide != '') {
      document.getElementById([imgHide]).style.visibility = "hidden";
      document.getElementById([imgHide]).style.display = "none";
    }
    if(typeof(imgShow) != 'undefined' && imgShow != '') {
      document.getElementById([imgShow]).style.visibility = "visible";
      document.getElementById([imgShow]).style.display = "block";
    }
  }
}

/**
 * Shows a layer
 * @param layer - name of the layer to be shown
 * @param imgHide - image to hide
 * @param imgShow - image to show
 */
function show(layer, imgHide, imgShow) {
  if(ie4) {
    document.all[layer].style.visibility = "visible";
    document.all[layer].style.display= "block";
    if(typeof(imgHide) != 'undefined' && imgHide != '') {
      document.all[imgHide].style.visibility = "hidden";
      document.all[imgHide].style.display = "none";
    }
    if(typeof(imgShow) != 'undefined' && imgShow != '') {
      document.all[imgShow].style.visibility = "visible";
      document.all[imgShow].style.display = "block";
    }
  }
  if(ns4) {
    document.layers[layer].visibility = "show";
  }
  if(ns6) {
    document.getElementById([layer]).style.visibility = "visible";
    document.getElementById([layer]).style.display = "block";
    if(typeof(imgHide) != 'undefined' && imgHide != '') {
      document.getElementById([imgHide]).style.visibility = "hidden";
      document.getElementById([imgHide]).style.display = "none";
    }
    if(typeof(imgShow) != 'undefined' && imgShow != '') {
      document.getElementById([imgShow]).style.visibility = "visible";
      document.getElementById([imgShow]).style.display = "block";
    }
  }
}

var __c = 0;
function toggle(n) {
  var obj = getObj('s' + n);
  if (obj != null) {
    if (obj.style.visibility == 'visible') {
      // hide
      hide('s' + n);
    } else {
      if (__c != 0) hide('s' + __c);
      // show
      show('s' + n);
      __c = n;
    }
  }
}

function getObj(name) {
  var obj = null;
  if (document.getElementById) {
    obj = document.getElementById(name);
  } else if (document.all) {
    obj = document.all[name];
  } else if (document.layers) {
    obj = document.layers[name];
  }
  return obj;
}

// ===================================================================
// String helper functions
// ===================================================================

/**
 * Full string trimmer - removes leading and trailing spaces
 */
function trim(str) {
  if(str == null || str == 'undefined') {
    return null;
  }
  // Match spaces at beginning and end of text and replace with null strings
  return str.replace(/^\s+/,'').replace(/\s+$/,'');
}

/**
 * Returns true if 'what' is part of 'where' using optional delimiter (default is '; ')
 */
function isPartOfString(what, where) {
  var delimiter = (arguments.length > 2) ? arguments[2] : "; ";
  return (what == where) ||
  	(where.indexOf(what+delimiter) == 0) ||
  	(where.indexOf(delimiter+what) == where.length-delimiter.length-what.length) ||
  	(where.indexOf(delimiter+what+delimiter) != -1);
}

function formatAmount(val) {
  var v = '' + (Math.abs(val) + 0.001);
  return v.substr(0, v.indexOf('.')+3);
}

function padLeft(s, l, p) {
  while(s.length < l) s = p + s;
  return s;
}

// ===================================================================
// Date/Time helper functions
// ===================================================================

/**
 * Calculates number of days in a month 'm' of year 'y'
 */
function daysInMonth(y, m) {
  with (new Date(y, m, 1, 12)) {
    setDate(0);
    return getDate();
  }
}

/**
 * Calculates a difference between two dates. Returns an array of years, months and days
 */
function diffDate(a1, a2) {
  var dm, dd;
  dm = (12 * a1[0] + a1[1]) - (12 * a2[0] + a2[1]);
  dd = a1[2] - a2[2];
  if(dd < 0) {
    dm--;
    dd += daysInMonth(a2[0], a2[1]);
  }
  return [(dm / 12) | 0, dm % 12, dd];
}

/**
 * Returns tru if a date is valid
 */
function validDate(y, m, d) {
  with (new Date(y, m, d)) {
    return (getMonth()==m && getDate()==d);
  }
}

/**
 * Parses a date. Format: MM-DD-YYYY or MM/DD/YYYY
 */
function parseDate(q) {
  var t;
  if( (t = /^(\d\d)([-\/])(\d\d)(\2)(\d+)$/.exec(q)) == null ) {
    return -2; // bad format
  }
  for(var j=1; j<=5; j+=2) {
    t[j] = +t[j]; // convert to numbers
  }
  if(!validDate(t[5], t[1]-1, t[3])) {
    return -1; // bad value
  }
  return [ t[5], t[1], t[3] ]
}


//  -------------------- Cookie functions

function getExpiry(days) {
  var timeSpan = days * 24 * 60 * 60 * 1000;
  var expDate  = new Date();
  expDate.setTime( expDate.getTime() + timeSpan );
  return expDate;
}

function logout(msg) {
  if(msg == null || confirm(msg)) {
    document.cookie  = "username=; expires=" + getExpiry(0).toGMTString() + "; path=/;";
    document.cookie  = "password=; expires=" + getExpiry(0).toGMTString() + "; path=/;";
    return true;
  }
  return false;
}

function getCookie(name) {
  var start = document.cookie.indexOf(name + "=");
  var len = start + name.length + 1;
  if((!start && name != document.cookie.substring(0, name.length)) || (start == -1)) return null;
  var end = document.cookie.indexOf(";", len);
  if(end == -1) end = document.cookie.length;
  return unescape(document.cookie.substring(len, end));
}

function setCookie(name, value, expires, path, domain, secure) {
  var today = new Date();
  today.setTime(today.getTime());
  if(expires) expires = expires * 1000 * 60 * 60 * 24;
  var expires_date = new Date(today.getTime() + expires);

  document.cookie = name + "=" + escape(value) +
    (expires ? ";expires=" + expires_date.toGMTString() : "") +
    (path ? ";path=" + path : "") + 
    (domain ? ";domain=" + domain : "") +
    (secure ? ";secure" : "");
}

function deleteCookie(name, path, domain) {
  if(getCookie(name)) document.cookie = name + "=" +
      (path ? ";path=" + path : "") +
      (domain ? ";domain=" + domain : "" ) +
      ";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}

//  -------------------- Check if cookie is enabled
var cookieSupportEnabled = false;
setCookie('test', 'none', '', '/', '', '');
if(getCookie('test')) {
  cookieSupportEnabled = true;
  deleteCookie('test', '/', '');
}


function printTextarea(cols, rows, name) {
  document.write('<textarea' +
    (cols > 0 ? ' cols="' + cols + '" ' : '') +
    (rows > 0 ? ' rows="' + rows + '" ' : '') +
    ' name="' + name + '"' +
    '></textarea>'
  );
}