function checkEmail(){
re = new RegExp("^[_a-zA-Z0-9\.\-]+@[_a-zA-Z0-9\.\-]+\.[a-zA-Z]{2,4}$");
if (!re.test(document.getElementById("email").value)) {
window.alert("Emailová adresa nemá správný formát / The email adress is invalid");
return false;
} else {
return true;
}
}
function showImage(img,xwidth,yheight){
var winl = (screen.width - xwidth) / 2;
var wint = (screen.height - yheight) / 2;
var a = window.open("","new","left="+winl+",top="+wint+",width="+xwidth+",height="+yheight);
if (parseInt(navigator.appVersion) >= 4) { a.window.focus(); }
a.document.writeln('');
a.document.writeln('Velký náhled');
a.document.writeln('');
a.document.writeln('
');
a.document.writeln('');
a.document.writeln('');
a.document.close();
}