这段代码怎么使之在firefox里正常运行！在线求解

function moveAlong(layerName, paceLeft, paceTop, fromLeft, fromTop){    clearTimeout(eval(layerName).timer)    if(eval(layerName).curLeft != fromLeft){        if((Math.max(eval(layerName).curLeft, fromLeft) - Math.min(eval(layerName).curLeft, fromLeft)) < paceLeft){eval(layerName).curLeft = fromLeft}        else if(eval(layerName).curLeft < fromLeft){eval(layerName).curLeft = eval(layerName).curLeft + paceLeft}            else if(eval(layerName).curLeft > fromLeft){eval(layerName).curLeft = eval(layerName).curLeft - paceLeft}        if(ie){document.all[layerName].style.left = eval(layerName).curLeft}        if(ns){document[layerName].left = eval(layerName).curLeft}    }    if(eval(layerName).curTop != fromTop){   if((Math.max(eval(layerName).curTop, fromTop) - Math.min(eval(layerName).curTop, fromTop)) < paceTop){eval(layerName).curTop = fromTop}        else if(eval(layerName).curTop < fromTop){eval(layerName).curTop = eval(layerName).curTop + paceTop}            else if(eval(layerName).curTop > fromTop){eval(layerName).curTop = eval(layerName).curTop - paceTop}        if(ie){document.all[layerName].style.top = eval(layerName).curTop}        if(ns){document[layerName].top = eval(layerName).curTop}    }    eval(layerName).timer=setTimeout('moveAlong("'+layerName+'",'+paceLeft+','+paceTop+','+fromLeft+','+fromTop+')',30)}function setPace(layerName, fromLeft, fromTop, motionSpeed){    eval(layerName).gapLeft = (Math.max(eval(layerName).curLeft, fromLeft) - Math.min(eval(layerName).curLeft, fromLeft))/motionSpeed    eval(layerName).gapTop = (Math.max(eval(layerName).curTop, fromTop) - Math.min(eval(layerName).curTop, fromTop))/motionSpeed    moveAlong(layerName, eval(layerName).gapLeft, eval(layerName).gapTop, fromLeft, fromTop)}function FixY(){    if(document.body.scrollTop>0){        if(ie){sidemenu.style.top = document.body.scrollTop+90}    }else{        if(ie){sidemenu.style.top = document.documentElement.scrollTop+90}    }        if(ns){sidemenu.top = window.pageYOffset+90}}

<script language="JavaScript" src="js/OnLineService.js" type="text/JavaScript"></script><script language="javascript">                                    window.onerror = function(){}                                    var expandState = 0;                                    function expand(){                                    if(expandState == 0){setPace('master', 0, 10, 10); if(ie){document.menutop.src = '../Themes/Skin_Default/Images/menui.jpg'}; expandState = 1;}                                    else{setPace('master', -196, 10, 10); if(ie){document.menutop.src='../Themes/Skin_Default/Images/menuo.jpg'}; expandState = 0;}                                    }                                    document.write("<style type=text/css>#master {LEFT: -196px; POSITION: absolute; TOP: 90px; VISIBILITY: visible; Z-INDEX: 999}</style>")                                    document.write("<table id=master width='218' border='0' cellspacing='0' cellpadding='0'><tr><td></td><td rowspan='2' valign='top'><img id=menu onMouseOver=javascript:expand() border=0 height=100 name=menutop src=../Themes/Skin_Default/Images/menuo.jpg width=30></td></tr>");                                    document.write("<tr><td valign='top'><table width='101%' border='0' cellpadding='0'><tr><td height='400' valign='top'><table width=100% height='100%' border=0 cellpadding=0 cellspacing=5 bordercolor='#666666' bgcolor=#A33244 style=FILTER: alpha(opacity=90)><tr>");                                    document.write("<td align='center' bordercolor='#ecf6f5'><font color=FFFFFF>ONLINE SERVICES<br><font size=+0.5><strong>在线服务中心</strong></font></font></td></tr><tr><td valign='top' bordercolor='#ecf6f5' align='center'>");                                    document.write("<iframe width='100%'  marginwidth='0' marginheight='0' height='350' src='kfu.aspx'  frameborder=0 allowTransparency='true'></iframe></td></tr></table></td></tr></table></td></tr></table>");                                    var ie = document.all ? 1 : 0                                    var ns = document.layers ? 1 : 0                                    var master = new Object('element')                                    master.curLeft = -200;   master.curTop = 10;                                    master.gapLeft = 0;      master.gapTop = 0;                                    master.timer = null;                                    if(ie){var sidemenu = document.all.master;}                                    if(ns){var sidemenu = document.master;}                                    setInterval('FixY()',100);                                                            //==============================================================================================================                              </script>