connollyc4 I have questions about this but first in order to see what you had going and to locate the "fixed text areas" and the 3 input text areas I had to add a doctype, HTML 4.01 Transitional. Then add body tags and an end tag for the <form>. If an answer to your problem is found it might not work if you are going to increase the numbers involved.
Code:
//Text Area part change depending on how many games
arr[0] = document.myForm.one.value;
arr[1] = document.myForm.two.value;
arr[2] = document.myForm.three.value;
//arr[3] = document.myForm.four.value;
//arr[4] = document.myForm.five.value;
//arr[5] = document.myForm.six.value;
//arr[6] = document.myForm.seven.value;
//arr[7] = document.myForm.eight.value;
//arr[8] = document.myForm.nine.value;
//arr[9] = document.myForm.ten.value;
//arr[10] = document.myForm.eleven.value;
//arr[11] = document.myForm.twelve.value;
//arr[12] = document.myForm.thirteen.value;
//arr[13] = document.myForm.fourteen.value;
//arr[14] = document.myForm.fifteen.value;
//arr[15] = document.myForm.sixteen.value;
Having 16 numbers may cause problems. I'd do the deed in the function checkforinvalid(obj) which wont work if more than 9 numbers are needed. This function allows zero to be entered, an error.
Next thing is using a textarea to display. Easy to click in and change everything. Why not divs with control over the display?
Lastly, you want two separate things to occur?
What I am trying to do is if you put the number '7' in input text area 1 then
all numbers in the 3rd fixed text area become disabled unless you delete the 7
if you type in text area 1 the number 5 then the
fixed text area disables 4 and 6 unless you delete the 5 to reselect.
The way I read this is = if you enter the number 7 no one else can choose 7, 8, or 9. Is that correct?
Before you post, read our: 
Disabling fixed textareas after a number is chosen
