// #############################################################################
// define the browser we have instead of multiple calls throughout the file
var userAgent = navigator.userAgent.toLowerCase();
var is_opera  = (userAgent.indexOf('opera') != -1);
var is_saf    = ((userAgent.indexOf('safari') != -1) || (navigator.vendor == "Apple Computer, Inc."));
var is_webtv  = (userAgent.indexOf('webtv') != -1);
var is_ie     = ((userAgent.indexOf('msie') != -1) && (!is_opera) && (!is_saf) && (!is_webtv));
var is_ie4    = ((is_ie) && (userAgent.indexOf("msie 4.") != -1));
var is_moz    = ((navigator.product == 'Gecko') && (!is_saf));
var is_kon    = (userAgent.indexOf('konqueror') != -1);
var is_ns     = ((userAgent.indexOf('compatible') == -1) && (userAgent.indexOf('mozilla') != -1) && (!is_opera) && (!is_webtv) && (!is_saf));
var is_ns4    = ((is_ns) && (parseInt(navigator.appVersion) == 4));

// catch possible bugs with WebTV and other older browsers
var is_regexp = (window.RegExp) ? true : false;

// #############################################################################
// find out what DOM functions we can use
var collapseDOMtype = '';
if (document.getElementById) {
  collapseDOMtype = "std";
} else if (document.all) {
  collapseDOMtype = "ie4";
} else if (document.layers) {
  collapseDOMtype = "ns4";
}

var collapseObjects = new Array();

// #############################################################################
// function to emulate document.getElementById
function fetch_object(idname, forcefetch) {
  if (forcefetch || typeof(collapseObjects[idname]) == "undefined") {
    switch (collapseDOMtype) {
      case "std": {
        collapseObjects[idname] = document.getElementById(idname);
      }
      break;

      case "ie4": {
        collapseObjects[idname] = document.all[idname];
      }
      break;

      case "ns4": {
        collapseObjects[idname] = document.layers[idname];
      }
      break;
    }
  }
  return collapseObjects[idname];
}

// #############################################################################
// function to handle the different event models and prevent event bubbling
function do_an_e(eventobj) {
  if (!eventobj || is_ie) {
    window.event.returnValue = false;
    window.event.cancelBubble = true;
    return window.event;
  } else {
    eventobj.stopPropagation();
    eventobj.preventDefault();
    return eventobj;
  }
}

// #############################################################################
// function to do a single-line conditional
function iif(condition, trueval, falseval) {
  return condition ? trueval : falseval;
}

// #############################################################################
// function to search an array for a value
function in_array(ineedle, haystack, caseinsensitive) {
  var needle = new String(ineedle);

  if (caseinsensitive) {
    needle = needle.toLowerCase();
    for (i in haystack) {
      if (haystack[i].toLowerCase() == needle) {
        return i;
      }
    }
  } else {
    for (i in haystack) {
      if (haystack[i] == needle) {
        return i;
      }
    }
  }
  return -1;
}

// #############################################################################
// function to set a cookie
function set_cookie(name, value, expires) {
  if (!expires) {
    expires = new Date();
  }
  document.cookie = name + "=" + escape(value) + "; expires=" + expires.toGMTString() +  "; path=/";
}

// #############################################################################
// function to retrieve a cookie
function fetch_cookie(name) {
  cookie_name = name + "=";
  cookie_length = document.cookie.length;
  cookie_begin = 0;

  while (cookie_begin < cookie_length) {
    value_begin = cookie_begin + cookie_name.length;
    if (document.cookie.substring(cookie_begin, value_begin) == cookie_name) {
      var value_end = document.cookie.indexOf (";", value_begin);
      if (value_end == -1) {
        value_end = cookie_length;
      }
      return unescape(document.cookie.substring(value_begin, value_end));
    }
    cookie_begin = document.cookie.indexOf(" ", cookie_begin) + 1;
    if (cookie_begin == 0) {
      break;
    }
  }
  return null;
}

// #############################################################################
// function to delete a cookie
function delete_cookie(name) {
  var expireNow = new Date();
  document.cookie = name + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT" +  "; path=/";
}

// #############################################################################
// function to toggle the collapse state of an object and save to a cookie
function toggle_collapse(objid) {
  if (!is_regexp) {
    return false;
  }
	
  obj = fetch_object("collapseobj_" + objid);	
  img = fetch_object("collapseimg_" + objid);
	
  if (!obj) {
    if (img) {
      img.style.display = "none";
    }
    return false;
  }

  if (obj.style.display == "none") {
    obj.style.display = "";
    save_collapsed(objid, true);
    if (img) {
      img_re = new RegExp("_collapsed\\.gif$");
      img.src = img.src.replace(img_re, '.gif');
    }
  } else {
    obj.style.display = "none";
    save_collapsed(objid, false);
    if (img) {
      img_re = new RegExp("\\.gif$");
      img.src = img.src.replace(img_re, '_collapsed.gif');
    }
  }
  return false;
}

// #############################################################################
// update collapse cookie with collapse preferences
function save_collapsed(objid, addcollapsed) {
  var collapsed = fetch_cookie("collapse");
  var tmp = new Array();

  if (collapsed != null) {
    collapsed = collapsed.split("\n");

    for (i in collapsed) {
      if (collapsed[i] != objid && collapsed[i] != "") {
        tmp[tmp.length] = collapsed[i];
      }
    }
  }

  if (addcollapsed) {
    tmp[tmp.length] = objid;
  }

  expires = new Date();
  expires.setTime(expires.getTime() + (1000 * 86400 * 365));
  set_cookie("collapse", tmp.join("\n"), expires);
}