Mistä selville kuvan koko Firefoxissa?

Hei,
alla oleva ohjelma toimii ihan hienosti IE-selaimessa, mutta ei Firefoxilla
(siis tuon kuvan koon tarkistamisen osalta).

Osaako kukaan auttaa?

Olisin tosi kiitollinen kaikesta avusta
Tuulia




var maxWidth=50;
var maxHeight=50;
var winWidth=0;
var winHeight=0;
var imgFileSize=0;
var maxFileSize=0;
var maxUnits="K";
maxFileSize = 1024;
if(maxUnits == "K") {
   maxFileSize = maxFileSize/1024;
   }

function getImage(imgID,fileID,spanID,whID,fsID) {
   document.getElementById(imgID).src="/images/image.gif";
   var filename=document.getElementById(fileID);
   if(!filename.value) {
      document.getElementById(spanID).style.visibility="hidden";
      } else {
    createImage(fileID);
    if(winWidth>50 || winHeight>50) {
         //alert(winWidth);
         //alert(winHeight);
         alert("Image must be 50 or less wide by 50 or less high");
document.getElementById(imgID).src="";
document.getElementById(whID).innerHTML="";
document.getElementById(spanID).style.visibility="hidden";
} else if(imgFileSize>1024) {
         alert("Image file size must be " maxFileSize " " maxUnits " or less");
         document.getElementById(imgID).src="";
document.getElementById(whID).innerHTML="";
document.getElementById(spanID).style.visibility="hidden";
         } else {
         document.getElementById(imgID).title=filename.value;
         document.getElementById(whID).innerHTML=winWidth " x " winHeight;
         if(imgFileSize > 1023) {
            document.getElementById(fsID).innerHTML=" : " imgFileSize/1024 "K";
            } else {
            document.getElementById(fsID).innerHTML=" : " imgFileSize " bytes";
            }
         document.getElementById(spanID).style.visibility="visible";
         }
      }
   }

function createImage(fileID) {
   var myimage = new Image();
   myimage.src = document.getElementById(fileID).value;
   return winWidth=myimage.width, winHeight=myimage.height, imgFileSize=myimage.fileSize;
   }

function showImg(fileID) {
   var features = "menubar=no, width=" winWidth ", height=" winHeight;
   var w = window.open('','imgWin',features);
   w.document.body.style.backgroundImage='url(' document.getElementById(fileID).value ')';
   w.resizeTo(winWidth 10,winHeight 28);
   w.document.body.style.backgroundRepeat='no-repeat';
   w.document.body.style.backgroundPosition='top left';
   w.document.close();
   }

function clearButtons() {
   for(i=0;i