function hiliteTopNavi(nr) {
	document.images["topnavi" + nr].src = topnavihip[nr].src;
}

function deliteTopNavi(nr) {
	if (nr != activeimage) {
		document.images["topnavi" + nr].src = topnavip[nr].src;
	}
}

var activeimage = "100";

function centerPopup(popup_name,popup_url,popup_with,popup_height,myWidth,myHeight,myScrollbar) {
    if(!myWidth) {myWidth = 10;}
    if(!myHeight){myHeight = 50;}
    if(!myScrollbar){myScrollbar = 0;}
    var popup_left = (window.screen.width/2)  - (popup_with/2 + myWidth);
    var popup_top  = (window.screen.height/2) - (popup_height/2 + myHeight);
    window.open(popup_url ,popup_name,"toolbar=no,location=no,status=no,menubar=no,scrollbars=" + myScrollbar + ",resizable=no,width=" + popup_with + ",height=" + popup_height + ",left=" + popup_left + ",top=" + popup_top + ",screenX=" + popup_left + ",screenY=" + popup_top);
}

function displayBackground(file) {
	document.body.style.backgroundImage      = "url(/img/backgrounds/" + file + ")";
	document.body.style.backgroundRepeat     = "repeat";
	document.body.style.backgroundAttachment = "fixed";
}