急需帮忙,图片滚动问题?

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<SCRIPT language=JavaScript>var ver = 3
bVer = parseInt(navigator.appVersion);
if(bVer >= 4) ver = 4var ns = navigator.appName == "Netscape";
var ie = navigator.appName == "MSIE";var pix = 3; 
var rate = 12; 
var ImgWidth = 905; var time = 1000/rate;
var again = - ImgWidthfunction tick() {if (ver ==3) returnif (ns){
document.Layer1.offset(-pix,0);document.Layer2.offset(-pix,0);if (document.Layer1.left <= again) document.Layer1.left = ImgWidth;if (document.Layer2.left <= again) document.Layer2.left = ImgWidth;
}
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