function isEmpty(obj)
{
	if($.trim(obj.value).length==0)
	{
		return true;
	}
	else
	{
		return false;
	}
}

function showTip(obj,tipString)
{
    var tip=$(obj).parent("div").prev("div");
	if(tip.children(".tip").length==0)
	{
		tip.children("span").after("<span class='tip'>"+tipString+"</span>");
	 	tip.children(".tip").fadeOut(2000,function(){
	 		tip[0].removeChild(this);
	 	}
	 	);
	 }
	 
}

function validateEmail(value)
{
	if(value.match(/\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/ig))
	{
		return true;
	}
	else
	{
		return false;
	}
}

function checkForm(objForm)
{
	var nick=objForm.elements["nick"];
	var email=objForm.elements["email"];
	var content=objForm.elements["content"];
	var title=objForm.elements["title"];
	if(isEmpty(nick))
	{
		showTip(nick,"\uFEFF\u6635\u79F0\u4E0D\u80FD\u4E3A\u7A7A");
		return false;
	}
	else if(isEmpty(email))
	{
		showTip(email,"\uFEFF\u90AE\u4EF6\u5730\u5740\u4E0D\u80FD\u4E3A\u7A7A");
		return false;
	}
	else if(!validateEmail(email.value))
	{
		showTip(email,"\uFEFF\u90AE\u4EF6\u5730\u5740\u4E0D\u6B63\u786E");
		return false;
	}
	else if(isEmpty(title))
	{
		showTip(title,"\uFEFF\u6807\u9898\u4E0D\u80FD\u4E3A\u7A7A");
		return false;
	}
	else if(isEmpty(content))
	{
		showTip(content,"\uFEFF\u7559\u8A00\u4E0D\u80FD\u4E3A\u7A7A");
		return false;
	}
	return true;
}