var whitespace = " \t\n\r";
function isEmpty(s) {
   return ((s == null) || (s.length == 0))
}

function isWhitespace (s) {
	var i;

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

    for (i = 0; i < s.length; i++) {   
        var c = s.charAt(i);

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

    return true;
}

function isEmail (s) {  
	
	if (isEmpty(s)) 
    	if (isEmail.arguments.length == 1) return defaultEmptyOK;
    else 
		return (isEmail.arguments[1] == true);
   
    if (isWhitespace(s)) return false;
    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;

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

    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
    else return true;
}

function verificarForm(objForm) {
    for(i = 0; i < objForm.length; i++) {
	    if(objForm[i].getAttribute('msgErro') && (objForm[i].value == "" || (objForm[i].getAttribute('verificar') == "validar_email" && !isEmail(objForm[i].value)))) {
		    alert(objForm[i].getAttribute('msgErro'));
		    objForm[i].focus();
		    return false;
	    }
    }
	return true;
}