function overlay() {
el = document.getElementById("overlay");
el.style.visibility = (el.style.visibility == "visible") ? "hidden" : "visible";
}


function submitform() {
var i=2;
var querystring='?submit=true';
if (document.forms[0].elements[0].checked==true)
	{
	querystring+="&chkPartner=Yes";
	}
else
	{
	querystring+="&chkPartner=No";
	} 
if (document.forms[0].elements[1].checked==true)
	{
	querystring+="&chkReceiveMore=Yes";
	}
else
	{
	querystring+="&chkReceiveMore=No";
	} 

for (i=2;i<=5;i++)
	{
	querystring+="&" + document.forms[0].elements[i].name + "=" + document.forms[0].elements[i].value;
	if(document.forms[0].elements[i].value==document.forms[0].elements[i].defaultValue)
		{
		alert('Please fill out all fields before submitting the form.');
		return false;
		}
	if (i==5)
		{
		if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(document.forms[0].elements[i].value))
			{
			}
		else 
			{
			alert("Please enter a valid Email Address.");
			return (false);
			}
		}
	}



  http.abort();
  http.open("GET", "script/send.php" + querystring, true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      overlay();
    }
  }
  http.send(null);
}