function popup(pic,b,h,show){
var maxb = screen.width;
var maxh = screen.height;
var v1 = h/b;
var v2 = maxh/maxb;
if (show) {
if(h < 480) {
h = 480;
b = Math.round(h/v1);
}
if (maxh > (1.67*h)) {
maxh = Math.round(1.67*h);
maxb = Math.round(maxh/v2);
}
if ((maxb*0.6) < b) {
b = maxb*0.6;
h = b*v1;
}
if ((maxh*0.6) < h){
h = maxh*0.6;
b = h/v1;
}
var posx = screen.width/2-maxb*0.8/2;
var posy = maxh*0.05;
var newWindow = window.open('show.php?pic='+pic+'&b='+Math.round(b)+'&h='+Math.round(h),'hallo','height='+(maxh*0.8)+'px, width='+(maxb*0.8)+'px, resizable=yes, scrollbars=yes');
newWindow.moveTo(posx,posy);
} else {
var posx = screen.width/2-b/2;
var posy = h*0.1;
var site='Popup![](\"'+pic+'\" "\\"Zum")
';
var newWindow = window.open('','','height='+h+'px, width='+b+'px, left='+posx+', top='+posy+', resizable=yes, scrollbars=no');
newWindow.document.write(site);
newWindow.document.close();
}
}