var ie4 = false; if(document.all) { ie4 = true; }
function getObject(id) { if (ie4) { return document.all[id]; } else { return document.getElementById(id); } }
	
	
function isValidEmail(email){
	var filter = /^([a-zA-Z0-9_\.\-_])+\@(([a-zA-Z0-9\-\._])+\.)+([a-zA-Z0-9_]{2,4})+$/;
	if (!filter.test(email))
		return false;
	else
		return true;
}

function isValidPasswordLenght(password){
	if (password.length<5)
		return false;
	else 
		return true;
}

function isEmptyField(field){
	if (field.replace(/^\s*|\s*$/g,"")=="")
		return true;
	else
		return false;
}