// JavaScript Document
function objOnOff(id) {
	var obj= document.getElementById(id);
	if (obj.style.display=='block') obj.style.display='none';
	else obj.style.display='block';
}

function check_email(email) {
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(email)) return false;
	return true;
}

function check_url(str) {
var v = new RegExp(); 
v.compile("^[A-Za-z]+://[A-Za-z0-9-_]+\\.[A-Za-z0-9-_%&\?\/.=]+$");
if (!v.test(str)) {
return false;
}
return true;
}