function check()
{
	var filter=/^.+@.+\..{2,3}$/ ; 
	if(!filter.test(document.register.email_address.value))
	 {
	 alert("Please input a valid email address!")
	 document.register.email_address.focus();
	 return false;
	 }
	 if(document.register.password.value=="")
		 {
		 alert("Please input a Password!")
		 document.register.password.focus();
		 return false;
		 }
	 return true;
}