var xmlhttp
var divid = "";

function checkField(str, thisdiv, code, field2)
{
divid = thisdiv;

str2 = field2;

//define which code to run
if(code=='inviteEmail')
{
php="inc/php/inviteEmail.php";
}
if(code=='textBox')
{
php="inc/php/textBox.php";
}
if(code=='mailingList')
{
php="inc/php/CheckMailingList.php";
}
if(code=='emailSyntax')
{
php="inc/php/CheckEmailSyntax.php";
}

if(code=='emailFormat')
{
php="inc/php/CheckEmailFormat.php";
}

if(code=='notBlank')
{
php="inc/php/FieldNotBlank.php";
}

if(code=='fieldsMatch')
{
php="inc/php/FieldsMatch.php";
}

if(code=='checkPassword')
{
php="inc/php/CheckPasswordSyntax.php";
}

if(code=='checkUsername')
{
php="inc/php/CheckUsername.php";
}

if(code=='add'){
php="inc/php/amount.php";
}

//give the value from the str2 variable an actual value


if (str.length==0)
  {
  document.getElementById(divid).innerHTML="<img src='images/invalid.png' /><div id='signupform-error'>This field cannot be left blank!</div>";
  return;
  }
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Your browser does not support XMLHTTP!");
  return;
  }
var url=php;
url=url+"?input="+str;
url=url+"&input2="+str2;
url=url+"&js=1";
url=url+"&sid="+Math.random();
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged()
{

if (xmlhttp.readyState==4)
  {
  document.getElementById(divid).innerHTML=xmlhttp.responseText;
  }
}

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}