// JScript File

function SetTextBoxEnabled(EnableNum)
{
    document.getElementById('ctl00_ContentPlaceHolder1_txtISBN1').disabled = true;
    document.getElementById('ctl00_ContentPlaceHolder1_txtISBN2').disabled = true;
    document.getElementById('ctl00_ContentPlaceHolder1_txtISBN3').disabled = true;
    document.getElementById('ctl00_ContentPlaceHolder1_txtISBN4').disabled = true;
    
    switch(EnableNum)
    {
        case 1:
            document.getElementById('ctl00_ContentPlaceHolder1_txtISBN1').disabled = false;
            break;
        case 2:
            document.getElementById('ctl00_ContentPlaceHolder1_txtISBN2').disabled = false;
            break;
        case 3:
            document.getElementById('ctl00_ContentPlaceHolder1_txtISBN3').disabled = false;
            break;
        case 4:
            document.getElementById('ctl00_ContentPlaceHolder1_txtISBN4').disabled = false;
            break;
        default:
            break;
    }
}