function LoginSystem () {
	User=window.document.LoginForm.Username.value;
	Pass=window.document.LoginForm.Passwd.value;
	if (User=="") {
		alert("请正确输入你的用户名");
        document.LoginForm.Username.focus();
        return false;
	}
	if (Pass=="") {
        alert("请正确输入你的密码");
        document.LoginForm.Passwd.focus();
        return false;
	}
	return true;
}
function CheckSearch () {
	KeyWords=window.document.SearchForm.KeyWords.value;
	ParentID=window.document.SearchForm.ParentID.value;
	if (KeyWords=="" && ParentID==0) {
		alert("请输入关键字或者选择一个频道");
        return false;
	}
	return true;
}
function click_select_td(id1,id2,id3) {
	if (document.all[id1].className!='select_card_on') {
		document.all[id1].className='select_card_on';
		document.all[id2].className='select_card_off';
		document.all[id3].className='select_card_off';
		document.all[id1+'div'].style.display='block';
		document.all[id2+'div'].style.display='none';
		document.all[id3+'div'].style.display='none';
	}
}
function OpenWindow(url,window_name,width1,height1) {
	if (width1=="")
		width1=520;
	if (height1=="")
		height1=550;
	var open_canshu="toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width="+width1+",height="+height1+",top="+((screen.availheight-height1)/2-20)+",left="+(screen.availwidth-width1)/2;
	window.open(url,window_name,open_canshu);
}