var img = new Array();
var img_anzahl=6;

// preload images
img[0] = "vis_faltstores.jpg";
img[1] = "vis_jalousien.jpg";
img[2] = "vis_markisen.jpg";
img[3] = "vis_rollladen.jpg";
img[4] = "vis_rollos.jpg";
img[5] = "vis_vertikal_jalousien.jpg";



function writeVisual(dir){
	document.write('<img src="'+dir+'/'+ img[randInt(0,img_anzahl-1)]+'" width="567" height="100" border="0" alt=""><br>');
}

function randInt(min,max)
{
        var div = (max - min) + 1
        var randNum = Math.random()
        for (var i = 0; i <= div - 1; i++)
        {
                if (randNum >= i / div && randNum < (i+1) / div)
                        {return i + min}
        }
}

function oeffneFenster(seitenName,instanzName,fensterBreite,fensterHoehe) {
			    breiteBildschirm = screen.availWidth;
			    hoeheBildschirm = screen.availHeight - 20;
			    randLinks = breiteBildschirm/2-(fensterBreite/2);
			    randOben = hoeheBildschirm/2-(fensterHoehe/2);
			    fensterParameter = "top="+randOben+",left="+randLinks+",width="+fensterBreite+",height="+fensterHoehe+",scrollbars=no,toolbar=no,status=no,resizeable=no,location=no,menubar=no";
			    satellitenFenster = window.open(seitenName,instanzName,fensterParameter);
				satellitenFenster.focus();
}