/* return element by id and elements by tagname */
gebi = function(x) {
	return document.getElementById(x);
};
gebtn = function(parent,child) {
	return parent.getElementsByTagName(child);
};

/* add an eventlistener */
function addEvent(target, eventType, functionRef, capture) {
  if (typeof target.addEventListener != "undefined") {
    target.addEventListener(eventType, functionRef, capture);
  } else if (typeof target.attachEvent != "undefined") {
    target.attachEvent("on" + eventType, functionRef);
  } else {
    eventType = "on" + eventType;
    if (typeof target[eventType] == "function") {
      var oldListener = target[eventType];
      target[eventType] = function() {
        oldListener();
        return functionRef();
      }
    } else {
      target[eventType] = functionRef;
    }
  }
  return true;
}

function detachEventListener(target, eventType, functionRef, capture) {
  if (typeof target.removeEventListener != "undefined") {
    target.removeEventListener(eventType, functionRef, capture)
  } else if (typeof target.detachEvent != "undefined") {
    target.detachEvent("on" + eventType, functionRef);
  } else {
    target["on" + eventType] = null;
  }
  return true;
}

/* stack load functions */
function addLoadListener(fn) {
  if (typeof window.addEventListener != 'undefined') {
    window.addEventListener('load', fn, false);
  } else if (typeof document.addEventListener != 'undefined') {
    document.addEventListener('load', fn, false);
  } else if (typeof window.attachEvent != 'undefined'){
    window.attachEvent('onload', fn);
  } else {
    var oldfn = window.onload;
    if (typeof window.onload != 'function') {
      window.onload = fn;
    } else {
      window.onload = function() {
        oldfn();
        fn();
      };
    }
  }
}

/* get the target of an event */
function getEventTarget(event) {
  var targetElement = null;
  if (typeof event.target != "undefined") {
    targetElement = event.target;
  } else {
    targetElement = event.srcElement;
  } while (targetElement.nodeType == 3 && targetElement.parentNode != null) {
    targetElement = targetElement.parentNode;
  }
  return targetElement;
}

/* stop an event's default action */
function stopDefaultAction(event) {
  event.returnValue = false;
  if (typeof event.preventDefault != "undefined") {
    event.preventDefault();
  }
  return true;
}

/* climb up the tree to the supplied tag. */
function ascendDOM(e, target) {
  while (e.nodeName.toLowerCase() != target && e.nodeName.toLowerCase() != 'html') {
    e = e.parentNode;
  }
  return (e.nodeName.toLowerCase() == 'html') ? null : e;
}

/* get an array of all the elements that have an attribute with a specific value */
function getElementsByAttribute(attribute, attributeValue) {
  var elementArray = new Array();
  var matchedArray = new Array();

  if (document.all) {
    elementArray = document.all;
  } else { 
    elementArray = document.getElementsByTagName("*");
  }
  for (var i = 0; i < elementArray.length; i++) {
    if (attribute == "class") {
      var pattern = new RegExp("(^| )" + attributeValue + "( |$)");
      if (elementArray[i].className.match(pattern)) {
        matchedArray[matchedArray.length] = elementArray[i];
      }
    } else if (attribute == "for") {
      if (elementArray[i].getAttribute("htmlFor") || elementArray[i].getAttribute("for")) {
        if (elementArray[i].htmlFor == attributeValue) {
          matchedArray[matchedArray.length] = elementArray[i];
        }
      }
    } else if (elementArray[i].getAttribute(attribute) == attributeValue) {
      matchedArray[matchedArray.length] = elementArray[i];
    }
  }
  return matchedArray;
}

/* use this to get a string of what browser the user has */
function identifyBrowser() {
  var agent = navigator.userAgent.toLowerCase();
  if (typeof navigator.vendor != "undefined" && navigator.vendor == "KDE" && typeof window.sidebar != "undefined") {
    return "kde";
  } else if (typeof window.opera != "undefined") {
    var version = parseFloat(agent.replace(/.*opera[\/ ]([^ $]+).*/, "$1"));
    if (version >= 7) {
      return "opera7";
    } else if (version >= 5) {
      return "opera5";
    }
    return false;
  }
  else if (typeof document.all != "undefined") {
    if (typeof document.getElementById != "undefined") {
      var browser = agent.replace(/.*ms(ie[\/ ][^ $]+).*/, "$1").replace(/ /, "");

      if (typeof document.uniqueID != "undefined") {
        if (browser.indexOf("5.5") != -1) {
          return browser.replace(/(.*5\.5).*/, "$1");
        } else {
          return browser.replace(/(.*)\..*/, "$1");
        }
      } else {
        return "ie5mac";
      }
    }
    return false;
  } else if (typeof document.getElementById != "undefined") {
    if (navigator.vendor.indexOf("Apple Computer, Inc.") != -1) {
      if (typeof window.XMLHttpRequest != "undefined") {
        return "safari1.2";
      }
      return "safari1";
    } else if (agent.indexOf("gecko") != -1) {
      return "mozilla";
    }
  }
  return false;
}

/* add the push and splice functions for unsupporting browsers */
Array.prototype.push = function() {
  for (var i = 0; i < arguments.length; i++) {
    this[this.length] = arguments[i];
  }
  return arguments[i - 1];
};
Array.prototype.splice = function(a, b) {
  var tmp = [];
  for (var i = a + b; i < this.length; i++) {
    tmp[tmp.length] = this[i];
  }
  var rem = [];
  for (i = a; i < a + b; i++) {
    rem[rem.length] = this[i];
  }
  this.length = a;
  
  for (i = 2; i < arguments.length; i++) {
    this[this.length] = arguments[i];
  }
  for (i = 0; i < tmp.length; i++) {
    this[this.length] = tmp[i];
  }
  return rem;
};

/* enter a cookie name to get its value */
function readCookie(name) {
    var cookieCrumbs = document.cookie.split(';');
    var nameToFind = name + '=';
    for (var i = 0; i < cookieCrumbs.length; i++) {
        var crumb = cookieCrumbs[i];
        while (crumb.charAt(0) == ' ') {
            crumb = crumb.substring(1, crumb.length); /* delete spaces */
        }
        if (crumb.indexOf(nameToFind) == 0) {
            return crumb.substring(nameToFind.length, crumb.length);
        }
    }
    return null;
}

function createCookie(name, value, days) {
    var expires = '';
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days*24*60*60*1000));
        var expires = '; expires=' + date.toGMTString();
    }
    document.cookie = name + '=' + value + expires + '; path=/';
}

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

Date.prototype.getDateString = function(str) {
  var dnames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday',
      'Thursday', 'Friday', 'Saturday', 'Sunday'];
  var mnames = ['January', 'February', 'March', 'April',
      'May', 'June', 'July', 'August', 'September',
      'October', 'Novemeber', 'December'];
	  
  str = str.replace('%day', dnames[this.getDay()]);
  str = str.replace('%date', this.getDate());
  str = str.replace('%ordinal', this.getDateOrdinal());
  str = str.replace('%month', mnames[this.getMonth()]);
  str = str.replace('%year', this.getFullYear());
  return str;
};

Date.prototype.getDateOrdinal = function() {
  var n = this.getDate();
  var ord = 'th';
  if (n % 10 == 1 && n % 100 != 11) {
    ord = 'st';
  } else if (n % 10 == 2 && n % 100 != 12) {
    ord = 'nd';
  } else if (n % 10 == 3 && n % 100 != 13) {
    ord = 'rd';
  }

  return ord;
};

Date.prototype.getISODate = function() {
  var mth = this.getMonth() + 1;
  mth = (mth < 10 ? '0' : '') + mth;
  var date = this.getDate();
  date = (date < 10 ? '0' : '') + date;
  return this.getFullYear() + mth + date;
};

function compare(a, b) {
	return b[0] - a[0];
}

function getViewportSize() {
  var size = [0,0];

  if (typeof window.innerWidth != 'undefined') {
    size = [
        window.innerWidth,
        window.innerHeight
    ];
  } else if (typeof document.documentElement != 'undefined'
      && typeof document.documentElement.clientWidth != 'undefined'
      && document.documentElement.clientWidth != 0) {
    size = [
        document.documentElement.clientWidth,
        document.documentElement.clientHeight
    ];
  } else {
    size = [
        document.getElementsByTagName('body')[0].clientWidth,
        document.getElementsByTagName('body')[0].clientHeight
    ];
  }
  return size;
}

function getScrollingPosition() {
  //array for X and Y scroll position
  var position = [0, 0];
  //if the window.pageYOffset property is supported
  if(typeof window.pageYOffset != 'undefined') {
    //store position values
    position = [
        window.pageXOffset,
        window.pageYOffset
    ];
  }
  //if the documentElement.scrollTop property is supported
  //and the value is greater than zero
  if(typeof document.documentElement.scrollTop != 'undefined'
    && document.documentElement.scrollTop > 0) {
    //store position values
    position = [
        document.documentElement.scrollLeft,
        document.documentElement.scrollTop
    ];
	//if the body.scrollTop property is supported
  } else if(typeof document.body.scrollTop != 'undefined') {
    //store position values
    position = [
        document.body.scrollLeft,
        document.body.scrollTop
    ];
  }
  //return the array
  return position;
}

function toggleSelects(vis) {
  if (typeof document.uniqueID != 'undefined'
      && typeof document.body.style.scrollbarTrackColor == 'undefined') {
    var selects = document.getElementsByTagName('select');
    for (var i = 0; i < selects.length; i++) {
      selects[i].style.visibility = vis;
    }
    return true;
  }
  return false;
}

/* allows you to make an ajax request */
function AJAXRequest(url, fn, m, cgi) {
  var requester;
  try {
    requester = new XMLHttpRequest();
  } catch (error) {
    try {
      requester = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (error) {
      requester = null;
    }
  }

  if (requester != null) {
    requester.onreadystatechange = function() {
      if (requester.readyState == 4) {  	
        if (requester.status == 200 || requester.status == 304) {
          fn(requester);
        } else {
          failure(requester);
        }
      }
      return true;
    };
	if (m.toUpperCase() == "GET") {
      requester.open("GET", url, true);
      requester.send(null);
	} else if (m.toUpperCase() == "POST") {
	  requester.open("POST", url, true);
	  requester.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
      requester.send(cgi);	
	}
  } else {
    return false;
  }
  return true;
}
/* failure function to run if the ajax fails */
function failure(requester) {
  alert("The XMLHttpRequest failed with status code: " + requester.status);
  return true;
}

/* returns a string in the format of name=value& that has all of a form's fieldnames with thier values */
function getFormData(obj) {
   var str = "";
   for (i=0; i<obj.elements.length; i++) {
	   switch(obj.elements[i].type) {
       	  case "text":
		  case "textarea":
		  case "password":
		  case "hidden":
		  case "submit":
             str += obj.elements[i].name + "=" + escape(obj.elements[i].value) + "&";
		  	 break;
		  case "checkbox":
             if (obj.elements[i].checked) {
                str += obj.elements[i].name + "=" + obj.elements[i].value + "&";
             } else {
                str += obj.elements[i].name + "=&";
             }
		     break;
          case "radio":
             if (obj.elements[i].checked) {
                str += obj.elements[i].name + "=" + obj.elements[i].value + "&";
             }
          	 break;
       	  case "select-one":		  
			  var sel = obj.elements[i];
			  str += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
			  break;
		  case "select-multiple":
		  	  var sel = obj.elements[i];
			  var list = "";
			  str += sel.name + "=";
			  for (var j=0; j<sel.options.length; j++) {
			  	if (sel.options[j].selected == true){
				  list += sel.options[j].value + ",";
			    }
			  }
			  /* get rid of the extra comma */
			  list = list.substring(0,(list.length - 1));
			  str += list + "&";
			  break;  
      	}      
   }
   /* get rid of the extra & */
   str = str.substring(0,(str.length - 1));
   return str;
}
/* takes a key to search the url's CGI variables for and returns its value if found */
function searchCGI(key) {
	var arr = new Array(null,null);
	var cgi = window.location.search;
	var pairs = cgi.substr(1,cgi.length).split("&");
	for (var i=0; i<pairs.length; i++) {
		var name = pairs[i].split("=")[0];
		var value = pairs[i].split("=")[1];
		if (name == key) {
			arr[0] = name;
			arr[1] = value;
			break;
		}		
	}
	return arr;	
}

/* takes a name and value to find in a url and if found sets a new name and value */
function setCGI(name, value, newName, newValue) {
	var regEx = new RegExp(name+"="+value);
	window.location.href = window.location.href.replace(regEx, newName+"="+newValue);
}