function validateEmail(email) {
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return filter.test(email);
}

function validateForm(){
	if(document.getElementById("fromName").value==""){
		alert("Please fill your name");
		document.getElementById("fromName").focus();
	}else if(document.getElementById("toName").value==""){
		alert("Please fill your friend's name");
		document.getElementById("toName").focus();
	}else if(!validateEmail(document.getElementById("fromEmail").value)){
		alert("Please enter valid email address");
		document.getElementById("fromEmail").focus();
	}else if(!validateEmail(document.getElementById("toEmail").value)){
		alert("Please enter valid email address");
		document.getElementById("toEmail").focus();
	}else{
		return true;
	}
	return false;
}