browser_name = navigator.appName; 
browser_version = parseFloat(navigator.appVersion);

if (browser_name == "Netscape" && browser_version >= 3.0) { roll = 'true'; } 
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) { roll = 'true'; } 
else { roll = 'false'; } 

function over(img,ref) { if (roll == 'true') { document.images[img].src = ref; } } 
if (roll == 'true') 
{
a1=new Image;a1.src="images/topbg.gif";
a2=new Image;a2.src="images/webdesign.gif";
a3=new Image;a3.src="images/webdesign-menubg.gif";
a4=new Image;a4.src="images/webdesign-home-hl.gif";
a5=new Image;a5.src="images/webdesign-map-hl.gif";
a6=new Image;a6.src="images/webdesign-mail-hl.gif";
a7=new Image;a7.src="images/webdesign-home.gif";
a8=new Image;a8.src="images/webdesign-map.gif";
a9=new Image;a9.src="images/webdesign-mail.gif";
a10=new Image;a10.src="images/webdesign-logo1.gif";
a11=new Image;a11.src="images/webdesign-logo2.gif";
a12=new Image;a12.src="images/webdesign-logo3.gif";
a13=new Image;a13.src="images/webdesign-design-hl.gif";
a14=new Image;a14.src="images/webdesign-entwicklung-hl.gif";
a15=new Image;a15.src="images/webdesign-solutions-hl.gif";
a16=new Image;a16.src="images/webdesign-quaelitat-hl.gif";
a17=new Image;a17.src="images/webdesign-design.gif";
a18=new Image;a18.src="images/webdesign-entwicklung.gif";
a19=new Image;a19.src="images/webdesign-solutions.gif";
a20=new Image;a20.src="images/webdesign-quaelitat.gif";
a21=new Image;a21.src="images/line1.gif";
a22=new Image;a22.src="images/line2.gif";
a23=new Image;a23.src="images/webdesign-menu-line.gif";
a24=new Image;a24.src="images/webdesign-menu-dot.gif";
a25=new Image;a25.src="images/webdesign.jpg";
a26=new Image;a26.src="images/webdesign-arrow.gif";
a27=new Image;a27.src="images/webdesign-bg-l.gif";
a28=new Image;a28.src="images/webdesign-s.gif";
a29=new Image;a29.src="images/webdesign-bg-r.gif";
a30=new Image;a30.src="images/webdesign-line.gif";
a31=new Image;a31.src="images/webdesign-arrow-bg.gif";
a32=new Image;a32.src="images/web-design.gif";
a33=new Image;a33.src="images/web-seite-erstellung.gif";
a34=new Image;a34.src="images/web-siete-promotion.gif";
a35=new Image;a35.src="images/botbgl.gif";
a36=new Image;a36.src="images/botline.gif";
a37=new Image;a37.src="images/botbgr.gif";
a38=new Image;a38.src="images/botbgr2.gif";
}

function checkreq() {
path = document.myform;
tmp = (path.username.value == "");
if (!tmp && (path.username.value.length < 2)) tmp = true;
path.Submit.disabled = tmp;
if (tmp) return;
tmp = (path.mailfrom.value == "");
if (!tmp && (path.mailfrom.value.length < 1)) tmp = true;
path.Submit.disabled = tmp;
if (tmp) return;
tmp = (path.telefon.value == "");
if (!tmp && (path.telefon.value.length < 5)) tmp = true;
path.Submit.disabled = tmp;
if (tmp) return;
tmp = (path.message.value == "");
if (!tmp && (path.message.value.length < 9)) tmp = true;
path.Submit.disabled = tmp;
}

function check() {
p_username = document.myform.username.value.toString();
if(p_username != "") { 
if(p_username.length<3 || p_username.length>20) {
alert ("Bitte geben Sie ihre Name richtig ein!/n Mindestens 3 Buchstaben.");
document.myform.username.select();
return false;
}
}
p_mailfrom = document.myform.mailfrom.value.toString();
if (p_mailfrom != "") {
t = p_mailfrom.indexOf("@");
if((p_mailfrom.indexOf(".") == -1) || (t == -1) || (t < 1) || (t > p_mailfrom.length - 5) || (p_mailfrom.charAt(t - 1) == '.') || (p_mailfrom.charAt(t + 1) == '.')) {
alert("Sie haben eine ungultige E-Mail eingegeben.");
document.myform.mailfrom.select();
return false;
}
}
p_telefon = document.myform.telefon.value.toString();
if (p_telefon != "") {
if ((p_telefon.length < 6) || (p_telefon.length > 15)) {
alert("Bitte geben Sie die Telefon Nummer richtig ein!/n Mindestens 6 Ziffiren, ohne Sonderzeichen.");
document.myform.telefon.select();
return false;
}
}
p_message = document.myform.message.value.toString();
if (p_message.length < 10) {
alert ("Bitte hinterlassen Sie uns eine Nachricht, was wir fur Sie tun konnen./n Mindestens 10 Buchstaben.");
document.myform.message.focus();
return false;
}
}