function showBIG(port, pname, title, nx, ny)
{
 var posX;
 var posY;
 var oArgs;
 var url;
 var nx;
 var ny;
 

 url = "showbig.html?ort=" + port + "&pic=" + pname + ".jpg&title=" + title ;
 posX = screen.availLeft+(screen.availWidth/2)-(nx/2);
 posY = screen.availTop+(screen.availHeight/2)-(nx/2);
 oArgs = "screenX=" + String(posX) + ",screenY=" + String(posY) + ",width=850,height=650,resizable=no";
 window.open( url, "_blank", oArgs);
}