var tipMessage = ['',"Please input your name!","Select your country",'Sorry, you have not inputted your email, or your email has something wrong with its format.','Input the topic','Input the related information'];
function tip(str)
{
	alert(str);
}
function changeClass(name,classID)
{
	document.getElementById(name).className=classID;
}
function ourPut(num,id)
{
	document.getElementById('tip'+num).innerHTML = "<font color='red'><b>"+tipMessage[id]+"</b></font>";
	if (id==0)
	{
		return true;
	}else
	{
		return false;
	}
}
function checkInput()
{
	if (document.getElementById('username').value=="")
	{
		return  ourPut(11,1);
	}else
	{
		ourPut(11,0); 
	}
	
	if (document.getElementById('nationality').value.toString()=="0")
	{
		return ourPut(1,2);
		
	}else
	{
		ourPut(1,0);
	}
	if (!isEmail(document.getElementById('email').value))
	{
		return  ourPut(2,3); 
	}else
	{
		ourPut(2,0); 
	}
	if (document.getElementById('subject').value=='')
	{
		return  ourPut(3,4); 
	}else
	{
		ourPut(3,0); 
	}
	if (document.getElementById('content').value=='')
	{
		return  ourPut(4,5); 
	}else
	{
		ourPut(4,0); 
	}
	return true;
	//检测EMAIL

}
function isEmail(strEmail) {
	if (strEmail.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
	return true;
	else
	return false;
}