// Bildinformationen

var        imgURL                = "bg/arrow_top.gif"

var        imgWidth        = 70        // Breite

var        imgHeight        = 120        // Hoehe



// Intervall fuer Positionspruefung in ms

var        posInterval        = 25



// Extraabstaende

var        extraX                = 20        // Abstand fuer vertikalen Rollbalken

var        extraY                = 20        // Abstand fuer horizontalen Rollbalken



// Position

var        wPosition        = 3        // 1: oben links, 2: oben rechts, 3: unten rechts, 4: unten links



// Zentrieren des Hintergrundbilds

function positionierung()

{

        var        ntop

        var        nleft



        if(document.Marke)

        {

                with(document.Marke)

                {

                        ntop        = window.pageYOffset

                        nleft        = window.pageXOffset

                        if(wPosition == 3 || wPosition == 4)

                                ntop        += innerHeight - imgHeight

                        if(wPosition == 2 || wPosition == 3)

                                nleft        += innerWidth - imgWidth

                        if(scrollbars.visible)

                        {

                                if(wPosition == 3 || wPosition == 4)

                                        ntop        -= extraX

                                if(wPosition == 2 || wPosition == 3)

                                        nleft        -= extraY

                        }

                        if(ntop != top || nleft != left)

                        {

                                top        = ntop

                                left        = nleft

                        }

                }

        }

        else if(Marke)

        {

                with(Marke)

                {

                        ntop        = document.body.scrollTop

                        nleft        = document.body.scrollLeft

                        if(wPosition == 3 || wPosition == 4)

                                ntop        += Number(document.body.clientHeight) - imgHeight

                        if(wPosition == 2 || wPosition == 3)

                                nleft        += Number(document.body.clientWidth) - imgWidth

                        if(ntop != style.top || nleft != style.left)

                        {

                                style.top        = ntop

                                style.left        = nleft

                        }

                }

        }

        else

                return

}



// Initialisierung der Darstellung

function init()

{

        if(document.Marke)

                with(document.Marke.document)

                {

                        open("text/html")

                        write("><A HREF=\"#top\" onClick=\"positionierung(); return true\"><IMG SRC=\"" + imgURL + "\" " +

                                "BORDER=0 " +

                                "WIDTH=" + imgWidth + " " +

                                "HEIGHT=" + imgHeight + " ALT=\"zum Seitenanfang\"></A>")

                        close()

                        width        = imgWidth

                        height        = imgHeight

                }

        else if(Marke)

                with(Marke)

                {

                        innerHTML        = "<A HREF=\"#top\" onClick=\"positionierung(); return true\"><IMG SRC=\"" + imgURL + "\" " +

                                        "BORDER=0 " +

                                        "WIDTH=" + imgWidth + " " +

                                        "HEIGHT=" + imgHeight + " ALT=\"zum Seitenanfang\"></A>"

                        style.width        = imgWidth

                        style.height        = imgHeight

                }

        else

                return

        positionierung()

        if(document.Marke)

                document.Marke.visibility        = "show"

        else

                Marke.visibility        = "visible"

        setInterval("positionierung()", posInterval)

}