function $(id){
	return document.getElementById(id);
}

function formCheck(el){

	var Error = false;

	if(el.name.value.length == 0){
		Error = true;
		el.name.style.backgroundColor = "red";
	}else
		el.name.style.backgroundColor = "";

	if(el.message.value.length == 0){
		Error = true;
		el.message.style.backgroundColor = "red";
	}else
		el.message.style.backgroundColor = "";

	if(el.email.value.length == 0 || el.email.value.indexOf('@') == -1 || el.email.value.indexOf('.') == -1){
		Error = true;
		el.email.style.backgroundColor = "red";
	}else
		el.email.style.backgroundColor = "";


	$('errorField').innerHTML = Error ? "Los campo(s) en rojo deben ser rellenado(s)." : "";
	if(!Error) $('sendButton').disabled = "disabled";
	return !Error;			
}