function check()
{
		
if (register.username.value=="") {
		alert("请输入用户名！");
		register.username.focus();		
		    return (false);
	}
if (checkstring("用户名", document.register.username.value, false)) {
    document.register.username.focus();
    return false;   
    }

if (document.register.username.value.length<2) {
    alert("用户名不能少于二位！");
	register.username.focus();
    return false;   
  }
else
		 document.register.submit();
}