function NieuwVenster(URL){
 if((screen.width == 640) && (screen.height == 480))
 window.open(URL,"voorbeeld", "directories=no,toolbar=no, status=no, menubar=no, resizable=yes, scrollbars=yes, width=600, height=400,top=5,left=10");
 else if((screen.width == 848) && (screen.height == 480))
 window.open(URL,"voorbeeld", "directories=no,toolbar=no, status=no, menubar=no, resizable=yes, scrollbars=yes, width=795, height=400,top=5,left=10");
 else if((screen.width == 800) && (screen.height == 600))
 window.open(URL,"voorbeeld", "directories=no,toolbar=no, status=no, menubar=no, resizable=yes, scrollbars=yes, width=600, height=400,top=5,left=10");
 else if((screen.width == 1024) && (screen.height == 768))
 window.open(URL,"voorbeeld", "directories=no,toolbar=no, status=no, menubar=no, resizable=yes, scrollbars=yes, width=1150, height=680,top=5,left=10");
 else((screen.width == 1024) && (screen.height == 768))
 window.open(URL,"voorbeeld", "directories=no,toolbar=no, status=no, menubar=no, resizable=yes, scrollbars=yes, width=990, height=680,top=5,left=10");
}