// Utility functions

function toggle_visibility(id) {
    var e = document.getElementById(id);
    if(e.style.display == 'none')
    e.style.display = 'block';
    else
    e.style.display = 'none';
}

// Function retrieved from: http://cass- hacks.com/articles/code/js_url_encode_decode/   
function URLEncode(clearString) {
    var output = '';
    var x = 0;
    clearString = clearString.toString();
    var regex = /(^[a-zA-Z0-9_.]*)/;
    while (x < clearString.length) {
        var match = regex.exec(clearString.substr(x));
        if (match != null && match.length > 1 && match[1] != '') {
            output += match[1];
            x += match[1].length;
        } else {
            if (clearString[x] == ' ')
                output += '+';
            else {
                var charCode = clearString.charCodeAt(x);
                var hexVal = charCode.toString(16);
                output += '%' + (hexVal.length < 2 ? '0' : '') + hexVal.toUpperCase();
            }
            x++;
        }
    }
    return output;
}

function AlphabeticOnly(ctrl, e, toupper) {
    var browser = navigator.appName;    // Microsoft Internet Explorer Netscape
    var keyCode;

    if (browser == "Microsoft Internet Explorer") {
        keyCode = e.keyCode;
    }
    else {
        keyCode = e.which;   //To get the keycode in other browser
    }
    
    if (toupper) 
    {
        // Convert to Upper Case
        if (keyCode > 96 && keyCode < 123) {
            keyCode = keyCode - 32;
            event.keyCode = keyCode;
        }
    }

    if (keyCode < 65 || keyCode > 90) 
    {
        if (!(keyCode == 0 || keyCode == 8 || keyCode == 32))
            return false;
    }
    return true;
}