function doClick(buttonName, e) {
    //the purpose of this function is to allow the enter key to 
    //point to the correct button to click.
    var key;

    if (window.event)
        key = window.event.keyCode;     //IE
    else
        key = e.which;     //firefox

    if (key == 13) {
        //Get the button the user wants to have clicked
        var btn = document.getElementById(buttonName);
        if (btn != null) { //If we find the button click it
            btn.click();
            event.keyCode = 0
        }
    }
}

function doEnter(tbName, e) {
    var key;

    if (window.event) {
        key = window.event.keyCode;     //IE
            if (key == 13) {
                var tb = document.getElementById(tbName);
                if (tb != null) {
                    tb.focus();
                    event.keyCode = 0;
                }
            }
    }
    else {
        
        key = e.which;     //firefox
           if (key == 13) {
            var tb = document.getElementById(tbName);
                if (tb != null) {
                    tb.focus();
                    e.preventDefault();  
                    e.returnValue = false; 
                    }
            }
    }
}