function checkdata() 
	{
		if (addform.username.value.length<4){alertFocus(addform.username,"登录出错，下面是产生错误的可能原因：\n\n·请输入正确的用户名。");return false;}
		if (addform.userpass.value =="" || addform.userpass.value.length<6 || addform.userpass.value.length>20) {alertFocus(addform.userpass,"登录出错，下面是产生错误的可能原因：\n\n·请输入 6-20 位的密码");return false;}
		return true;
	}
	function alertFocus(obj, msg)
	{
		alert(msg);
		try{obj.focus();}
		catch(e){}
	}

        
	document.write("<form id=\"addform\" name=\"addform\" method=\"post\" action=\"check.asp\" onSubmit=\"return checkdata()\">");
	document.write("<label>用户名</label> <input name=\"username\" type=\"text\" class=\"inp\" value=\"\" tabindex=\"1\"/>");
	document.write("<label>密&nbsp;&nbsp;&nbsp;码</label> <input type=\"password\" name=\"userpass\" class=\"inp\" tabindex=\"2\" /> ");
	document.write("<input name=\"\" type=\"submit\" class=\"orange\" value=\"会员登录\" /><input name=\"\" type=\"button\" class=\"blue\" value=\"会员注册\" onclick=\"location.href ='reg.asp';\"/>")
	document.write("<p><a href=\"#\">忘记密码？</a></p>")
	document.write("</form>");