//detect browser:
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 3) browserVer = "1";
else if (browserName == "Microsoft Internet Explorer" && browserVer == 4) browserVer = "1";
else browserVer = "2";

//preload images:
if (browserVer == 1) {
m1 = new Image(48,18);
m1.src = "images/m_o_nas_u.gif";
m1u = new Image(48,18);
m1u.src = "images/m_o_nas_d.gif";

m2 = new Image(107,19);
m2.src = "images/m_oferty_specjalne_u.gif";
m2u = new Image(107,19);
m2u.src = "images/m_oferty_specjalne_d.gif";

m3 = new Image(56,20);
m3.src = "images/m_uslugi_u.gif";
m3u = new Image(56,20);
m3u.src = "images/m_uslugi_d.gif";

m4 = new Image(162,20);
m4.src = "images/m_stomatologia_kosmetyczna_u.gif";
m4u = new Image(162,20);
m4u.src = "images/m_stomatologia_kosmetyczna_d.gif";

m5 = new Image(162,18);
m5.src = "images/m_stomatologia_zachowawcza_u.gif";
m5u = new Image(162,18);
m5u.src = "images/m_stomatologia_zachowawcza_d.gif";

m6 = new Image(74,20);
m6.src = "images/m_protetyka_u.gif";
m6u = new Image(74,20);
m6u.src = "images/m_protetyka_d.gif";

m7 = new Image(74,19);
m7.src = "images/m_chirurgia_u.gif";
m7u = new Image(74,19);
m7u.src = "images/m_chirurgia_d.gif";

m8 = new Image(86,19);
m8.src = "images/m_endodoncja_u.gif";
m8u = new Image(86,19);
m8u.src = "images/m_endodoncja_d.gif";

m9 = new Image(95,20);
m9.src = "images/m_implantologia_u.gif";
m9u = new Image(95,20);
m9u.src = "images/m_implantologia_d.gif";

m10 = new Image(101,19);
m10.src = "images/m_ortodoncja_u.gif";
m10u = new Image(101,19);
m10u.src = "images/m_ortodoncja_d.gif";

m11 = new Image(139,18);
m11.src = "images/m_finansowanie_u.gif";
m11u = new Image(139,18);
m11u.src = "images/m_finansowanie_d.gif";

m12 = new Image(74,22);
m12.src = "images/m_rejestracja_u.gif";
m12u = new Image(74,22);
m12u.src = "images/m_rejestracja_d.gif";

m13 = new Image(230,169);
m13.src = "images/most01.jpg";
m13u = new Image(230,169);
m13u.src = "images/most01.gif";
}
//image swapping function:
function hiLite(imgDocID, imgObjName, comment) {
if (browserVer == 1) {
document.images[imgDocID].src = eval(imgObjName + ".src");
window.status = comment; return true;
}}