Index or size negative or greater than the allowable amount (non-negative indexes)

When using Firefox, I continue to get the error described in the subject line for this block of code:

for(var i = 0; i < tables.length; i++)
{
    var j = rows.length - 1;
    while(j--)
    {                   
        if(hideDP && tables[i].innerHTML.indexOf(">D<") != -1)
        {   
            if(!platTag && !soulSilverTag && pearlTag)
            {
                tables[i].deleteRow(j);//ERROR IS ON THIS LINE
            }
        }

    }//end while loop (rows)
}//end for loop (tables)

I suspect that this error is due to the fact that I am somewhat new to creating reverse loops, but I specifically made a reverse loop in this example, because it made it easier to delete rows from the table. Note also that j is something like 24, and I am 0, so they are non-negative. Can someone shed some light on this for me?

EDIT: Full code can be found here .