Limit Text Field!!

Hi Team ,

I have text filed which will allow user to enter 826 character and re-add the available character count back to each control I want to restrict the user to enter values after character count reaches to zero .Let me know how to achieve this.

Following script is written on the change event of the textfield.

var  val1= TextField1.rawValue.

var len = val1.length;

var count= 826-len;

TextField2.rawValue = count;

Now i have to restrict teh user to enter value after character count reaches to zero.

Thanks,

Bharathi