Javascript Firefox vs. IE

Can anyone please tell me why the following code does not work in IE. We are developing an online store and this code displays a price and quantity table from our database.

Getting the data is no problem. But displaying it the way we need is a problem.

[CODE]
// if not a standard item then only show above minimum prices
// get the string from the current row – qty column
str = tableInfo[y].quantity;

// rip only the first number in that string
str = str.substring(0, temp);

// change that string to an integer
number = parseInt(str);
// display price chart with minimum quantities
// use the new integer
if(number > minimum || number == minimum)
{
// build and display table
}
[/CODE]

This code grabs the current row of 2 columns, price and quantity. Then converts the qty into an integer so I can create a conditional lower in code. This works great in Firefox but I just learned that it does not work in IE7. Any thoughts?

Thank you,
Scott

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