function validatePHPBackstageForm(form)  
{
	//alert("Here in validatePHPSubscribeForm"); 
	
	maysubmit = "true";  
	var user_input;
   
	if ((form.email.value == ""))
	{
        alert("Please enter your email.");
        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, senders email address is not valid.");
        maysubmit = false;
        form.email.focus();	
		form.email.value = "";
		form.email.select();
        return false;
     }
    if ((form.password.value == ""))
	{
        alert("Please enter your password.");
        maysubmit = false;
		form.password.focus();
				
		form.password.value = "";
		form.password.select();
        return false;
    }  
}    
function validatePHPEmailOnly(form)  
{
	maysubmit = "true";             
    
    
 	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;
}   
// 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;
}