These are errors for the page in FF. The second one tells me that is likely that the code got transformed somehow as && should be simply &&. Once the script parser finds an error like that it stops so, there are probably many more errors like it. How did you add the code to your page? A text editor is best.
Code:
Error: preloadImages is not defined
Source File: http://www.shopocart.com/viewItem.asp?idProduct=18
Line: 1
Error: missing ) after condition
Source File: http://www.shopocart.com/images/shopocart.js
Line: 4, Column: 65
Source Code:
if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
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