if (navigator.appVersion.indexOf("2.") != -1){
check = false;
}
if ((navigator.appVersion.indexOf("3.") != -1) && (navigator.appName.indexOf("Explorer") != -1)){
check = false;
}
else
 {
check = true;
}
if (check == true){
image1 = new Image();
image1.src = "fileadmin/images/wt1_logo.gif";
image1on = new Image();
image1on.src = "fileadmin/images/wt_ov.gif";
image1alt = new Image();
image1alt.src = "fileadmin/images/wt1_logo.gif";
 
image2 = new Image();
image2.src = "fileadmin/images/escrima_logo.gif";
image2on = new Image();
image2on.src = "fileadmin/images/escrima_ov.gif";  
image2alt = new Image();
image2alt.src = "fileadmin/images/escrima_logo.gif";  
 
image3 = new Image();
image3.src ="fileadmin/images/blitz_logo.gif";
image3on = new Image();
image3on.src = "fileadmin/images/blitz_ov.gif";
image3alt = new Image();
image3alt.src = "fileadmin/images/blitz_logo.gif";

image4 = new Image();
image4.src = "fileadmin/images/chikung_logo.gif";
image4on = new Image();
image4on.src = "fileadmin/images/chikung_ov.gif";
image4alt = new Image();
image4alt.src = "fileadmin/images/chikung_logo.gif";


}
imagealt = ""
function imageon(name){
if (imagealt != name){
        document[name].src = eval(name + "on.src");
}
}
function imageoff(name){
if (imagealt != name){
        document[name].src = eval(name + ".src");
}
}
function on(name){
        if (check == true){
imageon(name);
}
}
function off(name){
        if (check == true){
imageoff(name);
}
}
function alt(name){
if (check == true){
document[name].src = eval(name + "alt.src");
if (imagealt != name){
if (imagealt != ""){
document[imagealt].src = eval(imagealt + ".src");
}
}
imagealt = name
}
}