// JavaScript Document
function loginch()
{
	if (document.form2.username.value.length == 0)
	{
		alert("提示\n请输入用户名!");
		document.form2.username.focus();
document.form2.pwd.value="";
return   false;
		}
		if (document.form2.pwd.value.length == 0)
	{
		alert("提示\n请输入密码!");
		document.form2.pwd.focus();
document.form2.pwd.value="";
return   false;
		}
		if (document.form2.yzm.value.length == 0)
	{
		alert("提示\n请输入验证码!");
		document.form2.yzm.focus();
document.form2.pwd.value="";
return   false;
		}
  
	}