Check if textbox was read

I have a textbox with terms and conditions.
i want to make sure my user actually scrolls through the text box.
How can I check to see if the scroll bar is at the same point as the height of the box?
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Big MontyConnect With a Mentor Senior Web Developer / CEO of Commented:
if you use jquery, you could do it like this:

jQuery(function($) {
    $('#txtBox').bind('scroll', function() {
        if($(this).scrollTop() + $(this).innerHeight() >= this.scrollHeight) {
            alert('end reached');
            //-- i would set a flag here so that when you submit your form, check the flag and if it's true, continue submitting

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