function check_feeback(){
	if (CheckEmpty(document.getElementById('email'))) {
		alert("Please enter email address.");
		document.getElementById('email').focus();
		return false;
	} 

	
	if (document.getElementById('email').value !="")
	{	
		if(isEmail(document.getElementById('email').value)==false)
		{ 
			alert("Invalid email. Please re-enter");
			document.getElementById('email').focus();
			return false;
		}
		
	}

	if (CheckEmpty(document.getElementById('comments'))) {
		alert("Please enter feedback.");
		document.getElementById('comments').focus();
		return false;
	} 
	document.saveFeedbacks.target = '_top';
	return true;
}