// This variable is introduced to identify if the form has already been submitted for some action
// and to prevent any other action on the form till the page is refreshed.
var isFormSubmitted = false;

function ValidateForm()
{
	if(isFormSubmitted)
	{
		return false;
	}
	
	//Empty Check for Sender Name
	if(trim(document.forms[0].SenderName.value)== "")
	{
		alert("Your First Name cannot be empty.");
		document.forms[0].SenderName.focus();
		return false;
	}
	//Empty Check for Sender Email ID
	if(trim(document.forms[0].SenderEmailID.value)== "")
	{
		alert("Your E-mail Address cannot be empty.");
		document.forms[0].SenderEmailID.focus();
		return false;
	}
	//Validate Check for Sender Email ID
	 if(trim(document.forms[0].SenderEmailID.value).length > 60 )
	{
		alert("Your Email address should not be greater than 60 characters.");
		document.forms[0].SenderEmailID.focus();
		return false;
	}		
	if(!CheckEmailFormat(trim(document.forms[0].SenderEmailID.value)))
	{
		alert("Your E-mail Address is invalid. Please re-enter the E-mail Address.");
		document.forms[0].SenderEmailID.focus();
		return false;
	}
	//Empty Check for Recepient Name
	if(trim(document.forms[0].RecepientName.value)== "")
	{
		alert("Your Friend or Relative Name cannot be empty.");
		document.forms[0].RecepientName.focus();
		return false;	
	}
	//Empty Check for Recepient Email ID
	if(trim(document.forms[0].RecepientEmailID.value)== "")
	{
		alert("Your Friend or Relative E-mail Address cannot be empty.");
		document.forms[0].RecepientEmailID.focus();
		return false;
	}
	//Validate Check for Recepient Email ID
	 if(trim(document.forms[0].RecepientEmailID.value).length > 60 )
	{
		alert("Recepient Email address should not be greater than 60 characters.");
		document.forms[0].SenderEmailID.focus();
		return false;
	}		
	if(!CheckEmailFormat(trim(document.forms[0].RecepientEmailID.value)))
	{
		alert("Your Friend or Relative E-mail Address is invalid. Please re-enter the E-mail Address.");
		document.forms[0].RecepientEmailID.focus();
		return false;
	}
	//Function to check for Special Characters
	if( !checkSpecialCharacters() )
		return false;
		
	isFormSubmitted = true;	
	return true;
}

function setfocus()
{
    if(document.getElementById('btnSend_btnSend')!=null)
    {
        document.getElementById('btnSend_btnSend').focus();
    }
	return true;
}

function windowclose()
{
    window.close();
    return false;
}

function ReplaceSubject() {

    var strSubject;
    var strSenderName;

    strSenderName = document.getElementById('SenderName').value;
    strSubject = document.getElementById('Subject').value;

    if (strSubject.indexOf("[Sender's name]") != -1 && trim(strSenderName) != '') {
        document.forms[0].Subject.value = document.forms[0].Subject.value.replace("[Sender's name]", strSenderName);
    }
}

function ResetSubject(e) {
    if ((e.keyCode >= 9 && e.keyCode <= 45) || (e.keyCode >= 112 && e.keyCode <= 123)) {
    //Keep the subject intact
    }
    else { //reset the subject
        document.forms[0].Subject.value = document.getElementById('hdnDefSubject').value;
    }
}