Works on PC browser, fails on Mac Browser

Hi
I have been asked to fix a website called: www.amazingflygun.com. Everything works fine on both PC and Mac until the ordering mechanism.
When you try to order after having selected the country you are from, and you have keyed in how many of the product you require, on PC everything works fine. On a Mac, it gives me an error: An Error Occurred: No Country Information Found. I have gone through the code, and the only code which I suspect is :

<DIV id="Div1" style="display:none;position:abs olute;top:500;left:250;la yer-background-color:#ffffff;Z-Index:1">
<table align="center" border="1" bgcolor="#ffffff" ID="Table1">

Do Div layers give problems on Mac browsers? Its the same for Explorer and Netscape. Any help would be brilliant. Thank you.

I was about the give the site a slating but it is actually quite good apart from the home page.

Assuming the folowing are copy errors
"abs olute"
"la yer"
Then that code should work. Try a simplified version of the page until you have only the error remaining.