var whitespace = " \t\n\r";

    function stripCharsInBag (s, bag){
        var i;
        var returnString = "";
        for (i = 0; i < s.length; i++)
        {   
            var c = s.charAt(i);
            if (bag.indexOf(c) == -1) returnString += c;
        }
    
        return returnString;
    }

    function stripWhitespace (s) {   
        return stripCharsInBag (s, whitespace)
    }

    function isEmpty(s) {
     return ((s == null) || (s.length == 0))
    }

    function submitForm(name){
        var error='';
        var resp = true;

        if(isEmpty(document.forms[name].friendsEmail.value)){
            error = error + "Please enter your friends email address.\n";
            resp = false;
        } else {
            if(document.forms[name].friendsEmail.value.indexOf("@") < 1) {
                error = error + "Please enter valid friends email address.\n";
                resp = false;
            }
        }

        if(isEmpty(document.forms[name].Email.value)){
            error = error + "Please enter your email address.\n";
            resp = false;
        } else {
            if(document.forms[name].Email.value.indexOf("@") < 1) {
                error = error + "Please enter your valid email address.\n";
                resp = false;
            }
        }


        if(isEmpty(document.forms[name].message.value)){
            error = error + "Please enter your message.\n";
            resp = false;
        }

        if(isEmpty(document.forms[name].code.value)){
	            error = error + "Please enter the code.\n";
		                resp = false;
				        }

					
        if( resp == false ){
            alert(error);
            return false;
        }

        document.forms[name].submit();
    }