function ubahgambar(img_name,img_src) 
{
	document[img_name].src=img_src;
}

function createTarget(t){
var w = 310;
var h = 310;
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
window.open("", t, winprops);
return true;
}

function NewWindow(mypage, myname, w, h, scroll) {
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}

function NewTell(mypage, myname, w, h, scroll, email) {
var email = tell.email.value;
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
var URL = ""+mypage+"?&email="+email+"";
win = window.open(URL, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}

function cek_ortu_kritik ()
{
	var pengirim = kritik.pengirim.value;
	var email = kritik.email.value;
	var tentang = kritik.tentang.value;
	var pesan = kritik.pesan.value;
	if (pengirim.length==0)
		window.alert ("Maaf, nama pengirim harus terisi");
	else if (email.length==0)
		window.alert ("Maaf, email pengirim harus terisi");
	else if (tentang.length==0)
		window.alert ("Maaf, tentang atau mengenai masalah apa harus terisi");
	else if (pesan.length==0)
		window.alert ("Maaf, kritik atau saran harus terisi");
	else
		document.forms[2].submit();

}

function cek_bukutamu ()
{
	var nama = form1.nama.value;
	var pesan = form1.pesan.value;
	if (nama.length==0)
		window.alert ("Maaf, nama harus terisi");
	else if (pesan.length==0)
		window.alert ("Maaf, pesan harus terisi");
	else
		document.forms[2].submit();

}

function cek_input_topik ()
{
	var pengirim = form1.pengirim.value;
	var pesan = form1.pesan.value;
	if (pengirim.length==0)
		window.alert ("Maaf, pengirim harus terisi");
	else if (pesan.length==0)
		window.alert ("Maaf, penjelasan harus terisi");
	else
		document.forms[2].submit();

}

function cek_input_tanggapan ()
{
	var pengirim = form2.pengirim.value;
	var pesan1 = form2.pesan1.value;
	if (pengirim.length==0)
		window.alert ("Maaf, pengirim harus terisi");
	else if (pesan1.length==0)
		window.alert ("Maaf, tanggapan harus terisi");
	else
		document.forms[2].submit();

}