var BrowserVersion = 0
if (navigator.userAgent.indexOf("Mozilla/3.0") != -1  || navigator.userAgent.indexOf("Mozilla/4.0") != -1)
{
    BrowserVersion = 3;
    /* Pre-load images for later image replacement */  
    but0	= new Image(92,19);     but0.src     = "./img/musterF.gif";     
    but0a   = new Image(92,19);     but0a.src    = "./img/musterF_a.gif";    
    but1    = new Image(92,19);     but1.src     = "./img/extrasF.gif";    
    but1a   = new Image(92,19);     but1a.src    = "./img/extrasF_a.gif";    
    but2    = new Image(92,19);     but2.src     = "./img/domicilF.gif";    
    but2a   = new Image(92,19);     but2a.src    = "./img/domicilF_a.gif";    
    but3    = new Image(92,19);     but3.src     = "./img/linksF.gif";    
    but3a   = new Image(92,19);     but3a.src    = "./img/linksF_a.gif";    
    but4	= new Image(106,19);       but4.src     = "./img/logosF.gif";     
    but4a   = new Image(106,19);     but4a.src    = "./img/logosF_a.gif";    
    but5	= new Image(106,19);       but5.src     = "./img/ciF.gif";     
    but5a   = new Image(106,19);     but5a.src    = "./img/ciF_a.gif";    
    but6	= new Image(106,19);       but6.src     = "./img/beschriftungenF.gif";     
    but6a   = new Image(106,19);     but6a.src    = "./img/beschriftungenF_a.gif";    
    but7	= new Image(106,19);       but7.src     = "./img/ausstellungenF.gif";     
    but7a   = new Image(106,19);     but7a.src    = "./img/ausstellungenF_a.gif";    
    but8	= new Image(106,19);       but8.src     = "./img/cartoonsF.gif";     
    but8a   = new Image(106,19);     but8a.src    = "./img/cartoonsF_a.gif";    
    but9    = new Image(106,19);     but9.src     = "./img/feedbackF.gif";    
    but9a   = new Image(106,19);     but9a.src    = "./img/feedbackF_a.gif";    
    but10    = new Image(106,19);     but10.src     = "./img/infosF.gif";    
    but10a   = new Image(106,19);     but10a.src    = "./img/infosF_a.gif";    
   }
else if (navigator.userAgent.indexOf("MSIE") != -1) BrowserVersion = 1;
else if (navigator.userAgent.indexOf("Mozilla/2.0") != -1) BrowserVersion = 2;
else BrowserVersion = 0;

function set_focus(normal0,focus0)
{                               
    if (BrowserVersion == 3)
    {
            document.images[normal0].src = eval(focus0 + ".src")
    }
}