I have this javascript zoombox that only works in IE for me, is there a way to make it crossbrowser compatible?

<script language="JavaScript1.2">
<!--
var maxW,maxH,fromX,fromY,toX,toY,adjX,adjY,zBox,zStep=0,zLink,zNew;

function zoomBox(evt,zlink,maxw,maxh,tox,toy) {
if (arguments.length > 2) zNew=1;
scrollH=(window.pageYOffset!=null)?window.pageYOffset:document.body.scrollTop;
maxW=maxw?maxw:window.innerWidth?innerWidth:document.body.clientWidth;
maxH=maxh?maxh:window.innerHeight?innerHeight:document.body.clientHeight;
toX=tox?tox:0;
toY=(toy?toy:0)+scrollH;
fromX=evt.pageX?evt.pageX:evt.clientX;
fromY=(evt.pageY?evt.pageY:evt.clientY)+(document.all?scrollH:0);
adjX=toX+evt.screenX-fromX;
adjY=toY+evt.screenY-fromY;
if (document.createElement && document.body.appendChild && !zBox) {
zBox=document.createElement("div");
zBox.style.position="absolute";
document.body.appendChild(zBox);
} else if (document.all && !zBox) {
document.all[document.all.length-1].outerHTML+="<div id=zBoxDiv style=position:absolute></div>";
zBox=document.all.zBoxDiv;
} else if (document.layers && !zBox) {
zBox=new Layer(maxW);
zBox.style=zBox;
}
zLink=zlink;
doZoom();
}

function doZoom() {
zStep+=1;
zPct=(10-zStep)/10
if (document.layers) {
zBox.moveTo(toX+zPct*(fromX-toX),toY+zPct*(fromY-toY));
zBox.document.open();
zBox.document.write("<table width="+maxW*(1-zPct)+" height="+maxH*(1-zPct)+" border=2 cellspacing=0><tr><td></td></tr></table>");
zBox.document.close();
} else {
zBox.style.border="2px solid #999999";
zBox.style.left=toX+zPct*(fromX-toX);
zBox.style.top=toY+zPct*(fromY-toY);
zBox.style.width=maxW*(1-zPct);
zBox.style.height=maxH*(1-zPct);
}
zBox.style.visibility="visible";
if (zStep < 10) setTimeout("doZoom("+fromX+","+fromY+","+toX+","+toY+")",30);
else {
zBox.style.visibility="hidden";
zStep=0;
if (zLink && !zNew) location.href=zLink.href;
else if (zLink && zNew) {
var w=window.open(zLink.href,"","width="+maxW+",height="+maxH+",left="+adjX+",top="+adjY+",No,resizable");
zNew=null;
}
}
}
function MM_displayStatusMsg(msgStr) { //v1.0
status=msgStr;
document.MM_returnValue = true;
}
//-->
</script>