var id = 1;

function incId() {
	id++;
}

function decId() {
	id--;
}

function getId() {
	return id;
}

function validate(form_id, email) {
	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;		
	var address = document.forms[form_id].elements[email].value;
	if(address==""){
		return false;
	}
	if (reg.test(address) == false) {		
		return false;
	}
	else{
		return true;
	}
}