function notEmpty(id)
{
    var element = document.getElementById(id);
    var eValue = element.value;	
    if(eValue.length == 0) return false;
    else return true;
}

function validEmail(id)
{
    var element = document.getElementById(id);
    var eValue = element.value;
		var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		if (filter.test(eValue)) return true;
		else return false;
}