problem mit js-scroller im ie7

// This is configurable
var SCREEN_WIDTH = 825;

var STEPS = new Array(0, 40, 40, 50, 50, 60, 60, 100, 150, 200, 300);
var POSITIONS = new Array(0,825,1650,2475,3300,4250,6000);


var slideSteps = 100;

// This is fixed
var slideTimer = 0;
var slideStep = 60;
var isIE = -1 != navigator.appName.indexOf("Microsoft");
var isNN = -1 != navigator.appName.indexOf("Netscape");

function getXOffset() {
  if(window.window.pageXOffset)
    return window.pageXOffset;
  else if(document.body.scrollLeft)
    return document.body.scrollLeft;
  else return false;
}

function slideScreen(index) {
    // Clear slide timer
    if (0 != slideTimer) {
        clearTimeout(slideTimer);
        slideTimer = 0;
    }
    // Check if scroll is to an end
    // var finalLeft = (index - 1) * SCREEN_WIDTH;
    var finalLeft = POSITIONS[index-1]
    var currentLeft = getXOffset();
    if (currentLeft == finalLeft) {
        return;
    }
    // Scroll
    var isForward = currentLeft < finalLeft;
    // This adjustment is required for NN, whose scrollTo() is not reliable.
    if (slideStep > Math.abs(finalLeft - currentLeft)) {
        slideStep = Math.abs(finalLeft - currentLeft);
    }
    var scrollStep = isForward ? slideStep : -slideStep;
    scrollBy(scrollStep, 0);
    // Set next slide timer
    slideTimer = setTimeout("slideScreen(" + index + ")", 1000 / slideSteps);
} // slideScreen

function goToScreen(index) {
    if (!isIE && !isNN) {
        return;
    }

    //var finalLeft = (index - 1) * SCREEN_WIDTH;
    var finalLeft = POSITIONS[index-1]


 var currentLeft = getXOffset();
    if (finalLeft == currentLeft) {
        return;
    }
    var stepIndex = Math.round(Math.abs(finalLeft - currentLeft) / SCREEN_WIDTH);
    slideStep = STEPS[stepIndex];
    slideScreen(index);
} // goToScreen

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_reloadPage(init) {  //Updated by PVII. Reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_reloadPage(init) {  //Updated by PVII. Reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}

//-->