// Place your application-specific JavaScript functions and classes here
// This file is automatically included by javascript_include_tag :defaults
function numbersonly(myfield, e, dec){
    var key;
    var keychar;
    
    if (window.event) {
        key = window.event.keyCode;
    }
    else {
        if (e) 
            key = e.which;
        else 
            return true;
    }

    keychar = String.fromCharCode(key);
    
    // control keys
    if ((key == null) || (key == 0) || (key == 8) ||
    (key == 9) ||
    (key == 13) ||
    (key == 27)) 
        return true;
    
    // numbers
    else {
        if ((("0123456789").indexOf(keychar) > -1)) {
            return true;
        }
        
        // decimal point jump
        else 
            if (dec && (keychar == ".")) {
                myfield.form.elements[dec].focus();
                return false;
            }
            else {
                return false;
            }
    }
}