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 = "";
	if (!readCookie(name)) {
		document.cookie = name+"="+value+expires+"; path=/";
	}
}

function createnewCookie(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 createUseridCookie(name,value)
{
	document.cookie = name+"="+value+"; expires=Sun, 18 Jan 2038 00:00:00 GMT; path=/; domain=.bodc.ac.uk;";
}

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);
}

rnd.today=new Date();
rnd.seed=rnd.today.getTime();

function rnd() {
    rnd.seed = (rnd.seed*9301+49297) % 233280;
    return rnd.seed/(233280.0);
};

function rand(number) {
    return Math.ceil(rnd()*number);
};

var refer=document.referrer;
createnewCookie('referer',refer,0);
doc=document.location;
createnewCookie('document',doc,0);
tid = new Date();
timeid = tid.getTime();
if (!readCookie('sessionid')) {
   createCookie('sessionid',timeid,0);
}
if (readCookie('userid')) {
   var myuserid = readCookie('userid');
   if (myuserid.length < 14) {
      eraseCookie('userid');
   }
}
if (readCookie('__utmv')) {
   var myutmv = readCookie('__utmv');
   if (myutmv.length < 24) {
      eraseCookie('__utmv');
   }
}
if (!readCookie('__utmv') && readCookie('userid')) {
var myuserid = readCookie('userid');
document.cookie = "__utmv=174674225."+myuserid+"; expires=Sun, 18 Jan 2038 00:00:00 GMT; path=/; domain=.bodc.ac.uk;";
}
function Form_Validator(form) {
   if(document.all || document.getElementByID) {
      form.username.style.background ="white";
      form.password.style.background ="white";
   }

   var passwordokchar = form.password.value.match(/\b(^[a-zA-Z0-9]{1,}$)\b/gi);

   if (form.username.value == "") {
      form.username.focus();
      if(document.all || document.getElementByID) {
         form.username.style.background = "#EBEBEB";
      }
      alert('Please enter your username');
      return false;
   }

   if ((form.password.value == "") || (!passwordokchar)) {
      form.password.focus();
      if(document.all || document.getElementByID) {
         form.password.style.background = "#EBEBEB";
      }
      alert('Please enter your valid password containing only letters and numbers.');
      return false;
   }
   disableButton(form.submit);
   return(true);
}

function disableButton (button) {
   if (document.all || document.getElementById) {
      button.value = 'Authenticating';
      button.disabled = true;
   }
   else if (button) {
      button.oldOnClick = button.onclick;
      button.onclick = null;
      button.oldValue = button.value;
      button.value = 'Authenticating';
   }
}