compemailflag=false;
fieldcheckok=false;

function checkFieldEntry (form)
{
	
	if (form.sendersemail.value == "") 
	{
    	alert("Please enter your e-mail address.");
    	return fieldcheckok=false;
    }
    else	
		return fieldcheckok=true;
}


// Compare re-entered email
function compareemail(form)
{
	//compemailflag=true;
	if ((form.email.value!=form.compemail.value)||(form.compemail.value==""))
	{
		alert("E-mail check failed.");
		//alert("form.compemail.value= "+form.compemail.value);
		form.email.focus();
		form.email.select();
		compemailflag=false;
		return;
	}
	else
	{
		//alert("E-mail successful.");
		//alert("form.compemail.value= "+form.compemail.value);
		return compemailflag=true;
	}
}

//check email address here 
function checkemail(form)
{
	if (isEmail(form.email.value)==false)
	{
		alert("Invalid email address.");
		form.email.focus();
		form.email.select();
		return;
	}
	if (form.email.value=="")
	{
		alert("Please enter your email address");
		form.email.focus();
		form.email.select();
		return;
	}
	else
	{
 		emailflag=true;
		//alert("emailflag= "+emailflag);
		form.compemail.focus();
		form.compemail.select();
	}
}

// check card type selected
function submitForm(form)
{
	var cardstatus = form.options[form.selectedIndex].value;
	if ((cardnumber == "") ||(cardnumber == 0))
	{
		alert("no card number entered");
		cardnumberflag=false;
		form.form.cardnumber.focus();
		form.form.cardnumber.select();
		return;
	}
	else
	{
		cardnumberflag=true;
		return;
	}
	if ((cardstatus == "")||(cardstatus == 0))
	{
		alert("no card selected");
		cardtypeflag=false;
		form.form.userpayment.focus();
		form.form.userpayment.select();
		return;
	}
	else
	{
		cardtypeflag=true;
		return;
	}
}
function validateEmailOnly(form)  
{
	compareemail(form);
	maysubmit = "true";             
    if (!compemailflag)
    {
          	//alert("Email's do not match!");
            maysubmit = false;
			form.email.focus();
			form.email.value = "";
			form.email.select();
            return false;
     }
 	if (form.email.value == "") 
		{
            alert("Please enter your e-mail address.");
            maysubmit = false;
			form.email.focus();
			form.email.value = "";
			form.email.select();
            return false;
        }
	if ((form.email.value.indexOf("@")==-1) || (isEmail(form.email.value)==false))
		{ 
           	alert("Sorry, your email address is not valid.");
            maysubmit = false;
            form.email.focus();	
			form.email.value = "";
			form.email.select();
            return false;
         }
	if(maysubmit)
	{
        disableForm(form);
		//reset(form);
        return true;  
	}
	else
		return false;
}   

               

function reset(theform) 
{
theform.subscribename.value="";
theform.occupation.value="";
theform.organisation.value="";
theform.email.value="";
}

function disableForm(theform) 
{
	if (document.all || document.getElementById) 
	{
		for (i = 0; i < theform.length; i++) 
		{
			var tempobj = theform.elements[i];
			if (tempobj.type.toLowerCase() == "submit" || tempobj.type.toLowerCase() == "reset")
				tempobj.disabled = true;
		}
		setTimeout('alert("Your details have been submitted.")', 2000);
		return true;
	}
	else 
	{
		alert("Your details have been submitted...");
		return false;
   	}
}



// Check whether string s is empty.
function isEmpty(s)
{   return ((s == null) || (s.length == 0))
}

// Returns true if string s is empty or 
// whitespace characters only.
function isWhitespace (s)
{
    var whitespace = " \t\n\r";
    var i;

    // Is s empty?
    if (isEmpty(s)){return true;}

    // Search through characters one by one
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);

        if (whitespace.indexOf(c) == -1) return false;
    }

    // All characters are whitespace.
    return true;
}


// Email address must be of form a@b.c
function isEmail (s)
{   if (isEmpty(s)){return true;}
   
    // is s whitespace?
    if (isWhitespace(s)){return true;}
    
    // there must be >= 1 character before @, so we
    // start looking at character position 1 
    // (i.e. second character)
    var i = 1;
    var sLength = s.length;

    // look for @
    while ((i < sLength) && (s.charAt(i) != "@"))
    { i++
    }

    if ((i >= sLength) || (s.charAt(i) != "@")) return false;
    else i += 2;

    // look for .
    while ((i < sLength) && (s.charAt(i) != "."))
    { i++
    }

    // there must be at least one character after the .
    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
    else return true;
}