var ok=0

browserVersion="n2"

if (navigator.appName.charAt(0)=="N") {
	if (navigator.appVersion.charAt(0)=="4") {
                browserVersion="n4"
      }
      if (navigator.appVersion.charAt(0)=="3") {
			browserVersion="n3"
	}
}

if (navigator.appName.charAt(0)=="M") {
        if (navigator.appVersion.charAt(0)=="4") {
                browserVersion="m4"
        }
        else {
                browserVersion="m3"
        }
}

function openWindow(windowName){
    if (browserVersion=="n4" || browserVersion=="n3"){
        newWin=window.open (windowName,'display','toolbar=yes,location=no,directories=no,menubar=no,scrollbars=no,resizable=no,width=595,height=355')
    }
    if (browserVersion=="m3"){
        newWin=window.open (windowName,'display','toolbar=yes,location=no,directories=no,menubar=no,scrollbars=no,resizable=no,width=590,height=280')
    }
	if (browserVersion=="m4"){
        newWin=window.open (windowName,'display','toolbar=yes,location=no,directories=no,menubar=no,scrollbars=no,resizable=no,width=600,height=360')
    }
	newWin.focus()
}

if (browserVersion=="n3" || browserVersion=="n4" || browserVersion=="m4"){

	ok=1

	blank=new Image()
	lernen=new Image()
	reisen=new Image()
	shop=new Image()
	lernen_on=new Image()
	reisen_on=new Image()
	shop_on=new Image()
	lernen_frame=new Image()
	reisen_frame=new Image()
	shop_frame=new Image()


	blank.src="images/blank.gif"
	lernen.src="images/button_lermen.gif"
	reisen.src="images/button_reisen.gif"
	shop.src="images/button_shop.gif"
	lernen_on.src="images/button_lermenon.gif"
	reisen_on.src="images/button_reisenon.gif"
	shop_on.src="images/button_shopon.gif"
	lernen_frame.src="images/lernen_buttons_on.gif"
	reisen_frame.src="images/reisen_buttons_on.gif"
	shop_frame.src="images/shop_buttons_on.gif"
}



if ((navigator.appVersion.lastIndexOf('Mac') != -1) & (browserVersion=="n3")){
	ok=0
}


function on(option){
	if (ok){
		if (option=="ler")
		{
		document.images["lerb"].src=lernen_on.src
		document.images["frame1"].src=lernen_frame.src
		document.images["frame2"].src=blank.src
		document.images["frame3"].src=blank.src
		}
		if (option=="rei")
		{
		document.images["reib"].src=reisen_on.src
		document.images["frame2"].src=reisen_frame.src
		document.images["frame3"].src=blank.src
		document.images["frame1"].src=blank.src
		}
		if (option=="sho")
		{
		document.images["shob"].src=shop_on.src
		document.images["frame3"].src=shop_frame.src
		document.images["frame2"].src=blank.src
		document.images["frame1"].src=blank.src
		}
	}
}

function out(option){
	if (ok){
		if (option=="ler")
		{
		document.images["lerb"].src=lernen.src
		}
		if (option=="rei")
		{
		document.images["reib"].src=reisen.src
		}
		if (option=="sho")
		{
		document.images["shob"].src=shop.src
		}
	}

}