win = null;
function NewWindow(mypage,myname,w,h,scroll){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable=0';
	win = window.open(mypage,myname,settings);
}


function validate() {
	var msg = "";
	if (document.getElementById('name').value == "") msg += "You have to enter your name.\n";
	if (document.getElementById('phone').value == "" && document.getElementById('email').value == "") msg += "You have to enter your phone and/or e-mail.\n";
	if (document.getElementById('message').value == "") msg += "You have to enter your message.";
	
	if (msg == "") document.getElementById('form').submit();
	else alert(msg);
}