function checksubmit()
{
	var text = "";
	if(get("name") == "")
	{
		text += "Please enter name.\n";
	}
	if(!checkMail(get("email")))
	{
		text += "Please enter valid e-mail address.\n";
	}
	if(get("subject") == "")
	{
		text += "Please enter subject.\n";
	}
	if(get("message") == "")
	{
		text += "Please enter message.\n";
	}
	if(get("code") == "")
	{
		text += "Please enter verification code.\n";
	}
	
if(text != "")
	{
		alert(text);
		return false;
	}
	else
	{
		return true;
	}
}

function get(id)
{
	return document.getElementById(id).value;
}

function checkMail(x)
{
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(x))
	{
		return 1;
	}
	else 
	{
		return 0;
	}
}