function validate_required(field,alerttxt){
	with (field){
		if (value==null||value==""){
			alert(alerttxt);
			return false;
		}
		return true;
	}
}

function validate_email(field,alerttxt){
	with (field){
		apos=value.indexOf("@");
		dotpos=value.lastIndexOf(".");
		if (apos<1||dotpos-apos<2){
			alert(alerttxt);
			return false;
		}
		return true;
	}
}

function validate_form(thisform){
	with (thisform){
		if(!validate_required(name, "Name must be filled out!")){
			name.focus();
			return false;
		}
		if(!validate_required(tel, "Phone must be filled out!")){
			tel.focus();
			return false;
		}
		if(!validate_required(email, "Email must be filled out!")){
			email.focus();
			return false;
		}
		if(!validate_email(email,"Not a valid e-mail address!")){
			email.focus();
			return false;
		}		
		if(!validate_required(msg, "Message must be filled out!")){
			msg.focus();
			return false;
		}
	}
	return true;
}