function sendmail()
{
	var val = document.frm_mail;	
	if(val.your_name.value=="")
	{
		alert("Please enter the name.");
		val.your_name.focus();
		return false;
	}
	if(val.your_email.value!="")
	{
		if(isValidEmail(val.your_email.value)==false)
		{
			alert("Please enter valid email address.");
			val.your_email.focus();
			return false;
		}
	}
	else
	{
		alert("Please enter your email address.");
		val.your_email.focus();
		return false;
	}  
	if(val.friend_email.value!="")
	{
		if (isWhitespace(val.friend_email.value))
		{
			alert("Please enter friend's email address.");
			val.friend_email.focus();			
		}
		else
		{
			if(isValidEmail(val.friend_email.value)==false)
			{
				alert("Please enter valid friend's email address.");
				val.friend_email.focus();
				return false;
			}
		}
	}	
	else
	{
		alert("Please enter friend's email address.");
		val.friend_email.focus();
		return false;
	}  
	if(val.message.value=="")
	{
		alert("Please enter message.");
		val.message.focus();
		return false;
	}
}