// JavaScript Document
function checkloginform()
{ var username = document.getElementById("username").value; 
var password=document.getElementById("psw").value; 
var verifycode = document.getElementById("rnd").value; 
if (username.length<2) 
{ alert('请填写用户名!');	
 document.getElementById("username").focus(); return false; } 
if (password.length<2)
{ alert('请填写密码!'); document.getElementById("psw").focus(); return false; }
if (verifycode.length<2)
{ alert('请填写验证码!'); document.getElementById("rnd").focus(); return false; } 
return true; }


function checkform1() 
{
var selected=0 ; 
var ids=document.getElementsByName("ids"); 
for(i=0;i<ids.length;i++) 
{if (form1.ids[i].checked) 
{ selected++; 
break; } 
} 
if (selected==0) 
{ alert("请您至少选择一门课程。"); 
return false;} 
else 
{ return true; } 
}