function checkEmail(id) {
var email = document.getElementById(id);
var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if (!filter.test(email.value)) {
return false;
}
if(email.value == "" ){
return false;
}
if(email.value.length < 6){
return false;
}
return true;
}